2 points.
The available variables are here:
So the ones you try to use do not exist.
Then the current list of tags (snapshot above) is currently limited.
I’m trying to get them directly from exiv2. This would provide a complete list of tags which can be used with an image.
NB. exif tags come straight away from raw image (except maybe geo tags for example). So you don’t need to set them. Here the utility would be to remove them from the exported file (no formula), if you don’t want them.