Have not implemented on Damus yet. Not sure if other apps have.
You are looking for relay sets https://github.com/damus-io/damus/issues/453
Nice!
Would be cool to know who implemented it.
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nostr:npub1r0rs5q2gk0e3dk3nlc7gnu378ec6cnlenqp8a3cjhyzu6f8k5sgs4sq9ac do you know?
