What you looking for are so called "long form" posts. Most clients support reading it. But few allow you to create them. Here is an example: nostr:naddr1qq2nva25233yv6rcgenz6n20f96j6ujpddm4sqgwwaehxw309ahx7uewd3hkctczyql2kfruvwanthar3cru5yp0dk3gh2de6358r9m5800r52caszhw6qcyqqq823c7z7j4t