Customizing setting up Darktable for Windows

It has wb data so I think its supported…from source code

//Canon EOS R Firmware Version 1.8.0
{ “Canon”, “EOS R”, Daylight , -9, { 1.7900390625, 1, 1.640625, 0 } },
{ “Canon”, “EOS R”, Daylight , -8, { 1.8125, 1, 1.6181640625, 0 } },
{ “Canon”, “EOS R”, Daylight , -7, { 1.8349609375, 1, 1.5947265625, 0 } },
{ “Canon”, “EOS R”, Daylight , -6, { 1.8623046875, 1, 1.5703125, 0 } },
{ “Canon”, “EOS R”, Daylight , -5, { 1.892578125, 1, 1.546875, 0 } },
{ “Canon”, “EOS R”, Daylight , -4, { 1.9208984375, 1, 1.5234375, 0 } },
{ “Canon”, “EOS R”, Daylight , -3, { 1.943359375, 1, 1.4990234375, 0 } },
{ “Canon”, “EOS R”, Daylight , -2, { 1.96875, 1, 1.4755859375, 0 } },
{ “Canon”, “EOS R”, Daylight , -1, { 1.99609375, 1, 1.4501953125, 0 } },
{ “Canon”, “EOS R”, Daylight , 0, { 2.0234375, 1, 1.423828125, 0 } },
{ “Canon”, “EOS R”, Daylight , 1, { 2.0517578125, 1, 1.404296875, 0 } },
{ “Canon”, “EOS R”, Daylight , 2, { 2.0771484375, 1, 1.3837890625, 0 } },
{ “Canon”, “EOS R”, Daylight , 3, { 2.107421875, 1, 1.36328125, 0 } },
{ “Canon”, “EOS R”, Daylight , 4, { 2.1337890625, 1, 1.34375, 0 } },
{ “Canon”, “EOS R”, Daylight , 5, { 2.1650390625, 1, 1.3232421875, 0 } },
{ “Canon”, “EOS R”, Daylight , 6, { 2.1884765625, 1, 1.3046875, 0 } },
{ “Canon”, “EOS R”, Daylight , 7, { 2.216796875, 1, 1.2861328125, 0 } },
{ “Canon”, “EOS R”, Daylight , 8, { 2.24609375, 1, 1.267578125, 0 } },
{ “Canon”, “EOS R”, Daylight , 9, { 2.2802734375, 1, 1.2470703125, 0 } },
{ “Canon”, “EOS R”, Shade , -9, { 2.0478515625, 1, 1.40625, 0 } },
{ “Canon”, “EOS R”, Shade , -8, { 2.0771484375, 1, 1.3857421875, 0 } },
{ “Canon”, “EOS R”, Shade , -7, { 2.1025390625, 1, 1.365234375, 0 } },
{ “Canon”, “EOS R”, Shade , -6, { 2.12890625, 1, 1.345703125, 0 } },
{ “Canon”, “EOS R”, Shade , -5, { 2.16015625, 1, 1.3251953125, 0 } },
{ “Canon”, “EOS R”, Shade , -4, { 2.1884765625, 1, 1.3056640625, 0 } },
{ “Canon”, “EOS R”, Shade , -3, { 2.216796875, 1, 1.2880859375, 0 } },
{ “Canon”, “EOS R”, Shade , -2, { 2.24609375, 1, 1.2685546875, 0 } },
{ “Canon”, “EOS R”, Shade , -1, { 2.275390625, 1, 1.2490234375, 0 } },
{ “Canon”, “EOS R”, Shade , 0, { 2.3115234375, 1, 1.2275390625, 0 } },
{ “Canon”, “EOS R”, Shade , 1, { 2.337890625, 1, 1.2119140625, 0 } },
{ “Canon”, “EOS R”, Shade , 2, { 2.3701171875, 1, 1.1953125, 0 } },
{ “Canon”, “EOS R”, Shade , 3, { 2.3984375, 1, 1.17578125, 0 } },
{ “Canon”, “EOS R”, Shade , 4, { 2.4326171875, 1, 1.1572265625, 0 } },
{ “Canon”, “EOS R”, Shade , 5, { 2.4677734375, 1, 1.138671875, 0 } },
{ “Canon”, “EOS R”, Shade , 6, { 2.4912109375, 1, 1.1240234375, 0 } },
{ “Canon”, “EOS R”, Shade , 7, { 2.515625, 1, 1.107421875, 0 } },
{ “Canon”, “EOS R”, Shade , 8, { 2.546875, 1, 1.0908203125, 0 } },
{ “Canon”, “EOS R”, Shade , 9, { 2.5791015625, 1, 1.0732421875, 0 } },
{ “Canon”, “EOS R”, Cloudy , -9, { 1.9248046875, 1, 1.51953125, 0 } },
{ “Canon”, “EOS R”, Cloudy , -8, { 1.9462890625, 1, 1.4970703125, 0 } },
{ “Canon”, “EOS R”, Cloudy , -7, { 1.97265625, 1, 1.4716796875, 0 } },
{ “Canon”, “EOS R”, Cloudy , -6, { 2.0, 1, 1.4462890625, 0 } },
{ “Canon”, “EOS R”, Cloudy , -5, { 2.02734375, 1, 1.421875, 0 } },
{ “Canon”, “EOS R”, Cloudy , -4, { 2.056640625, 1, 1.40234375, 0 } },
{ “Canon”, “EOS R”, Cloudy , -3, { 2.0810546875, 1, 1.3818359375, 0 } },
{ “Canon”, “EOS R”, Cloudy , -2, { 2.111328125, 1, 1.3603515625, 0 } },
{ “Canon”, “EOS R”, Cloudy , -1, { 2.1376953125, 1, 1.33984375, 0 } },
{ “Canon”, “EOS R”, Cloudy , 0, { 2.1650390625, 1, 1.3193359375, 0 } },
{ “Canon”, “EOS R”, Cloudy , 1, { 2.1923828125, 1, 1.302734375, 0 } },
{ “Canon”, “EOS R”, Cloudy , 2, { 2.2216796875, 1, 1.283203125, 0 } },
{ “Canon”, “EOS R”, Cloudy , 3, { 2.2509765625, 1, 1.2646484375, 0 } },
{ “Canon”, “EOS R”, Cloudy , 4, { 2.2861328125, 1, 1.244140625, 0 } },
{ “Canon”, “EOS R”, Cloudy , 5, { 2.322265625, 1, 1.224609375, 0 } },
{ “Canon”, “EOS R”, Cloudy , 6, { 2.3486328125, 1, 1.2080078125, 0 } },
{ “Canon”, “EOS R”, Cloudy , 7, { 2.3759765625, 1, 1.1904296875, 0 } },
{ “Canon”, “EOS R”, Cloudy , 8, { 2.4091796875, 1, 1.171875, 0 } },
{ “Canon”, “EOS R”, Cloudy , 9, { 2.4443359375, 1, 1.15234375, 0 } },
{ “Canon”, “EOS R”, Tungsten , -9, { 1.2763671875, 1, 2.2861328125, 0 } },
{ “Canon”, “EOS R”, Tungsten , -8, { 1.294921875, 1, 2.2607421875, 0 } },
{ “Canon”, “EOS R”, Tungsten , -7, { 1.3115234375, 1, 2.2353515625, 0 } },
{ “Canon”, “EOS R”, Tungsten , -6, { 1.330078125, 1, 2.2119140625, 0 } },
{ “Canon”, “EOS R”, Tungsten , -5, { 1.349609375, 1, 2.18359375, 0 } },
{ “Canon”, “EOS R”, Tungsten , -4, { 1.369140625, 1, 2.15625, 0 } },
{ “Canon”, “EOS R”, Tungsten , -3, { 1.3857421875, 1, 2.12890625, 0 } },
{ “Canon”, “EOS R”, Tungsten , -2, { 1.404296875, 1, 2.09375, 0 } },
{ “Canon”, “EOS R”, Tungsten , -1, { 1.423828125, 1, 2.064453125, 0 } },
{ “Canon”, “EOS R”, Tungsten , 0, { 1.4443359375, 1, 2.0322265625, 0 } },
{ “Canon”, “EOS R”, Tungsten , 1, { 1.462890625, 1, 2.0078125, 0 } },
{ “Canon”, “EOS R”, Tungsten , 2, { 1.4814453125, 1, 1.98046875, 0 } },
{ “Canon”, “EOS R”, Tungsten , 3, { 1.50390625, 1, 1.9501953125, 0 } },
{ “Canon”, “EOS R”, Tungsten , 4, { 1.5263671875, 1, 1.9208984375, 0 } },
{ “Canon”, “EOS R”, Tungsten , 5, { 1.548828125, 1, 1.892578125, 0 } },
{ “Canon”, “EOS R”, Tungsten , 6, { 1.5703125, 1, 1.8681640625, 0 } },
{ “Canon”, “EOS R”, Tungsten , 7, { 1.5927734375, 1, 1.841796875, 0 } },
{ “Canon”, “EOS R”, Tungsten , 8, { 1.615234375, 1, 1.8154296875, 0 } },
{ “Canon”, “EOS R”, Tungsten , 9, { 1.640625, 1, 1.7900390625, 0 } },
{ “Canon”, “EOS R”, CoolWhiteFluorescent, -9, { 1.5078125, 1, 2.23046875, 0 } },
{ “Canon”, “EOS R”, CoolWhiteFluorescent, -8, { 1.5302734375, 1, 2.2021484375, 0 } },
{ “Canon”, “EOS R”, CoolWhiteFluorescent, -7, { 1.5537109375, 1, 2.1787109375, 0 } },
{ “Canon”, “EOS R”, CoolWhiteFluorescent, -6, { 1.5751953125, 1, 2.1513671875, 0 } },
{ “Canon”, “EOS R”, CoolWhiteFluorescent, -5, { 1.59765625, 1, 2.1201171875, 0 } },
{ “Canon”, “EOS R”, CoolWhiteFluorescent, -4, { 1.623046875, 1, 2.08984375, 0 } },
{ “Canon”, “EOS R”, CoolWhiteFluorescent, -3, { 1.646484375, 1, 2.056640625, 0 } },
{ “Canon”, “EOS R”, CoolWhiteFluorescent, -2, { 1.6708984375, 1, 2.02734375, 0 } },
{ “Canon”, “EOS R”, CoolWhiteFluorescent, -1, { 1.6923828125, 1, 2.0, 0 } },
{ “Canon”, “EOS R”, CoolWhiteFluorescent, 0, { 1.71484375, 1, 1.96875, 0 } },
{ “Canon”, “EOS R”, CoolWhiteFluorescent, 1, { 1.7412109375, 1, 1.943359375, 0 } },
{ “Canon”, “EOS R”, CoolWhiteFluorescent, 2, { 1.7685546875, 1, 1.9140625, 0 } },
{ “Canon”, “EOS R”, CoolWhiteFluorescent, 3, { 1.79296875, 1, 1.8896484375, 0 } },
{ “Canon”, “EOS R”, CoolWhiteFluorescent, 4, { 1.8154296875, 1, 1.8623046875, 0 } },
{ “Canon”, “EOS R”, CoolWhiteFluorescent, 5, { 1.841796875, 1, 1.8349609375, 0 } },
{ “Canon”, “EOS R”, CoolWhiteFluorescent, 6, { 1.8681640625, 1, 1.8095703125, 0 } },
{ “Canon”, “EOS R”, CoolWhiteFluorescent, 7, { 1.896484375, 1, 1.7841796875, 0 } },
{ “Canon”, “EOS R”, CoolWhiteFluorescent, 8, { 1.9248046875, 1, 1.759765625, 0 } },
{ “Canon”, “EOS R”, CoolWhiteFluorescent, 9, { 1.9501953125, 1, 1.7353515625, 0 } },
{ “Canon”, “EOS R”, WhiteFluorescent , 0, { 1.71484375, 1, 1.96875, 0 } },
{ “Canon”, “EOS R”, Flash , -9, { 1.9658203125, 1, 1.5166015625, 0 } },
{ “Canon”, “EOS R”, Flash , -8, { 1.9921875, 1, 1.4951171875, 0 } },
{ “Canon”, “EOS R”, Flash , -7, { 2.0234375, 1, 1.46875, 0 } },
{ “Canon”, “EOS R”, Flash , -6, { 2.0478515625, 1, 1.4443359375, 0 } },
{ “Canon”, “EOS R”, Flash , -5, { 2.0771484375, 1, 1.419921875, 0 } },
{ “Canon”, “EOS R”, Flash , -4, { 2.1025390625, 1, 1.400390625, 0 } },
{ “Canon”, “EOS R”, Flash , -3, { 2.12890625, 1, 1.3798828125, 0 } },
{ “Canon”, “EOS R”, Flash , -2, { 2.16015625, 1, 1.3583984375, 0 } },
{ “Canon”, “EOS R”, Flash , -1, { 2.1884765625, 1, 1.3388671875, 0 } },
{ “Canon”, “EOS R”, Flash , 0, { 2.2119140625, 1, 1.318359375, 0 } },
{ “Canon”, “EOS R”, Flash , 1, { 2.24609375, 1, 1.30078125, 0 } },
{ “Canon”, “EOS R”, Flash , 2, { 2.275390625, 1, 1.28125, 0 } },
{ “Canon”, “EOS R”, Flash , 3, { 2.3115234375, 1, 1.2626953125, 0 } },
{ “Canon”, “EOS R”, Flash , 4, { 2.337890625, 1, 1.2431640625, 0 } },
{ “Canon”, “EOS R”, Flash , 5, { 2.3701171875, 1, 1.2236328125, 0 } },
{ “Canon”, “EOS R”, Flash , 6, { 2.3984375, 1, 1.2060546875, 0 } },
{ “Canon”, “EOS R”, Flash , 7, { 2.4326171875, 1, 1.1875, 0 } },
{ “Canon”, “EOS R”, Flash , 8, { 2.4677734375, 1, 1.169921875, 0 } },
{ “Canon”, “EOS R”, Flash , 9, { 2.4912109375, 1, 1.150390625, 0 } },

And its noted in the release notes for 3.8 as part of the libraw support

The camera needs to set white balance in order to develop the data and produce a jpg (also preview). In post-processing raw data it helps the software to duplicate what the camera developed to know what white balance to use.

I think what we’re calling the input profile pertains to the color space of the sensor. The camera also needs to know this in order to develop a jpg. That is why I think I should be able to get it for raw processing. I also think Canon should be a more trustworthy provider for their cameras than is Adobe.

However, i did post this on the Canon forums and it doesn’t sound like this is something they expect to do.