Inside a share extension on iOS you can extract the original HTML and CSS. Maybe Damus parses the html from the note and displays it in a web view?
I do similar things in nostr:nprofile1qqsdcsnzjwyfc0pgtspupdm5zzu09mx04m4jwvcalyq7cg44jju74xqpzemhxue69uhhyetvv9ujuurjd9kkzmpwdejhgqfxwaehxw309ahx7umxd3shyefwwfhhjctvvashyar9wgh8wmmjddjhyuewv3jhvvf6032 Contex.st
