Maybe you could download the customised bookmark list and import it into notes for example?
Discussion
Either way you will still want to move the content of the notes from Nostr to something else to archive. If you’re just bookmarking the note then what happens when relays have to start purging old notes to create more storage room.
Could you maybe download and store it on nostr.build for example? nostr:npub137c5pd8gmhhe0njtsgwjgunc5xjr2vmzvglkgqs5sjeh972gqqxqjak37w
Run your own relay that preserves your own posts, then it will always be available 💜🤙
nostr1.com
relaying.io