These profiles aren’t open source and most profiles that are available out-of-the-box in FOSS editors are created and tested by dedicated developers/users.
You can get them if you download and install Adobe DNG Converter (which is free, but not open source). This comes with Adobe’s Standard profiles and many, many Camera (type) specific profiles. Like the Vivid, Landscape, Neutral/Natural, Flat, Monochrome etc profiles that can be set in-camera. I looked at one of your PlayRaw topics and you seem to have an X-T3 which means that you would be limited to the Adobe Standard profile. Not sure why that is.
These are DCP profiles, though, and cannot be used in darktable (which is limited to ICC profiles). To my knowledge there are no DCP to ICC converters. There is, see @paperdigits’s reply below.
You can create camera specific profiles yourself, which is what @dim did looking at the above ICC profile. I have done/do this: How to Create DCP Color Profiles. This is DCP specific, though. Most of the info comes from this site: DCamProf - a digital camera profiling tool. There’s also info about creating ICC profiles (which are rather limited when comparing to DCP profiles) if I remember correctly.
Maybe @dim can point you to the ICC creation info that he used if you are interested.