I think this was the intent of https://github.com/nostr-protocol/nips/blob/master/39.md, which nostr:npub1xhe9408d5hm3dpwax78sy9nuc5warycnvcy4r3qzv6jacwu26r6s5m56yf started implementing on https://nostr.directory, but the idea was to make a decentralized nostr.directory, I think.

We should still be able to improve the NIP and get it actually running though.