TL,DR

What Gotham Knights?

It was the rebirth thing in detective comics. Basically the Batfamily as a twam. The comics had Azrael, Cass, Batwing, Batwoman, Batman and Clayface. Idk what this is about, but if a game is made, id assume the members would be different.

Like... Square Enix's Avengers but with Batman's team of Avengers from Detective Comics?

Better because it is hopefully not a live service game.