I think nos offers a button

https://testflight.apple.com/join/4NGNqUEQ

I wouldn’t be surprised if they offer a relay at some point that does some magic to keep the notes only there so they can truest be ephemeral or deleted

if you want to get really technical with it you could use one of these tools

https://snowcait.github.io/nostr-playground/

https://github.com/vishalxl/nostr_console

and follow the formatting of the nip

https://github.com/nostr-protocol/nips/blob/master/09.md

but I wouldn’t rely on this