Perhaps nice readable text, action bar at the bottom (like podcasts) for play, voice choice, speed, prev and next paragraph selection. Also allow people to start playing by tapping on a paragraph. Text is followed (highlighted) as spoken
Discussion
Have you tried iOS text to speech? 
big fan, just looking for more integration use cases
If someone drops a 20,000 word long reads, having more in-app tools could be interesting
https://github.com/damus-io/damus/issues/1377
Damus limited resources means that we will not reinvent and text to speech framework. We can explore playback capability as suggested by y’all.
nostr:npub1uapy44zhu5f0markfftt7m2z3gr2zwssq6h3lw8qlce0d5pjvhrs3q9pmv