Game using integrated graphics - how to add to GeForce Experience supported list?

Our players are reporting bad performance now and then, and this is often tracked down to the fact that the PC is running the game on integrated graphics. The only solution is to ask the users to add the game to the High performance/3D apps manually.

How can Nvidia detect this correctly?
Is this something that can be solved by getting added to the Geforce supported games list, if so, how to apply for that list?