I can’t find any specific Yes / No via search and my understanding is that’s not really possible due to how federated websites work, so hopefully someone more knowledgeable than me can give me a straight answer.
I had something I wanted to post that wasn’t very relevant to any particular community, but more specific to me, kinda like a blog post.
Beauty of the fedi, you can post from one instance to another without needing a separate account. For example mine is a single person instance with no local comms, yet here I am.
Edit: I think I missed the intent of the question. What you would look for is just the same of the comm@instance.tld on your own local base and assuming that federation functional between the instances it’ll show up to subscribe to. There’s no translation needed, but if you’re the first to subscribe from your home instance it might not show up right away.