A question about multi-communities (the new feature being tested)

Will the multi-communities be able to handle communities from multiple instances?

Like communities from lemmy.eco.br and lemmy.pt that are country agnostic, like !dev@lemmy.eco.br and !devpt@lemmy.pt, that are development communties, but pulverized across instances, so creating multi-communities across both instances would make good onboarding on both sides.

Just asking to see what would be capable, to atract more people easily, showing more "content", etc.