I follow several substack blogs and they all follow the same convention. I don't follow any related community chats.
Here's an example of one that I follow
Regular Order website address
https://jamiedupree.substack.com/
Regular Order RSS feed:
@juliesbits @matunos @tante
Ah, OK, The was a spare "/" in the URL in the previous post.
But when I said "community", the community chat was what I meant... But I see that that's now available on the actual post pages, which is better than needing the app.