SamyGO

I don't know. PSxxB650 series doesnt have Game menu too. If we find what to modify, than we could import that to CHL5 series too.

I can say that, "hw" supports games library in this TV. But "software" does not. This means you can run this program in this tv. But I don't know what is required to make such a thing.
AFAIK no one is working on such a task to implement game mode to B550.