Gossip currently interprets incoming quote posts pretty well I think. But it is not generating them properly when you compose a quote post yourself, it still doesn't support NIP-27 in that regard and puts '# [ 0 ]' kind of things in the content instead of 'nostr : nevent' links. This is in the process of being reworked.

nostr:#[1]

I've made changes to nostr-types to define NostrBech32 and NostrUrl with to/from string functionality, extracting from notes, handling of all nostr URLs, and handling of the 'nostr:' prefix. But I just pushed it and gossip isn't using it yet. There is still a tricky bit about when to include an 'e' tag and when not to.