I think this was raised a few weeks ago as well. So may be closed as a duplicate, or merged.
Functionally, probably possible. But what’s the value-add for the playerbase at large? Is it an addition that benefits a large portion of players? I’m not so sure. Grand Prix is a quick race mode rather than something that people buy the game for and not really a great expansion market. If I was in charge of allocating resources, it’s not something I think would be an avenue I’d want to divert interest into. Unless suggestions are quick-wins, or great value-add opportunities, then I’d not expect to see them in F125 and I think F126 will be hectic enough with the regulations change and Madrid coming.
I get that you’d be able to manipulate results to your hearts content but that’s something that might be best left to Michael Masi!