Ask your client of your choice to implement it or implement it yourself. There is a NIP for it:
https://github.com/nostr-protocol/nips/blob/master/25.md
Sgiath /
npub1qq…hlwh5
2022-12-25 12:58:33 UTC
in reply to nevent1q…re6h
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npub1qqqqq2z444usdf6k306djuwcyptfjj4x0teu7qzg4qj5zkkfqeeq3hlwh5Seen on
wss://relay.nostr.band