Suggested

2nd team or academy championsh

Ability to make a 2nd team (like Alpha Tauri in real life) or making a championship with academy drivers next to the normal one

You can create a second account.

But you can't use the drivers you got in your first team academy

Or is there a way to sell them and buy them with your second team?

Yes, you can sell them and buy with 2nd team, using an auction.

I don't understand why a team is needed specifically for testing youth drivers, because 90% of their specifications are in driver "quality"...
People usually create more accounts because they want to race in more leagues.