That could be very welcome. I don't see inside everyone's intentions, but that cooperation could result in a perfect and informative companion for the game - while less work and research than the individual development.
As a sidenote, let me mention, that I am a little bit surprised, that we can not have a mobile app that shows for example the instrument cluster - live. If GTS tries to be realistic, then the instruments are not quite in place on the TV screen. We should have some holder on our wheels (or behind it) for a tablet or a phone, which can show the tacho, rpm and every other info. There is some kind of "secondary screen" option on PS4 as far as I know.