Honestly, I need to link up nostr-rss with a blossom server to make a Nostr native feed for softwar if I can.
Discussion
Just a separate npub for the audiobook. Some clients already upload directly to blossoms so you can use that or you can run a script to upload the chapters simultaniously to different blossoms and the links from that go in notes. Then it goes njump.me/npub.rss or you can run self-hosted nostr-rss or something, for any reader that supports mp3 or whatever the format. I am quite annoyed with antennapod that does not support m3u8 so I can watch zap.stream there 🤣 but the link still good to open in browser. Same for any media from rss incapable of open in app.
Not entirely nostr but combined with rss works. I got it modified to fetch live events and flarepubs and yakihonne videos along with the media in kind 1s. Relays though return up to a certain events so you may have to republish from time to time.
The rss app becomes like pokey if notifications on 🤣