They already have that for squad requirements, for example we had to have at least 8 home grown players in our squad of 22 and at least 7 in our matchday squad for every game.

In the Premier League, they have to have 8 home grown players in a squad of 25.

The thing is though, a home grown player is a player of any nationality that has been registered for a club in England or Wales for at least 3 years prior to their 21st birthday, so clubs in the Premier League bring in young kids into their academies at 15 and by the time they're at the age to make the first team, they count as home grown, even if they're French, Spanish, Brazilian or whatever.