There really are quite a few apps due to the recent popularity, many are new and/or still in development. So pointing you towards an app that has that feature is tricky. Here is a list of what I’m aware on Android. I would suggest finding a few you like the look of, and then asking for such a feature?
Thunder for Lemmy: https://github.com/hjiangsu/thunder
Liftoff: https://github.com/liftoff-app/liftoff/
Jerboa: https://play.google.com/store/apps/details?id=com.jerboa
Summit: https://play.google.com/store/apps/details?id=com.idunnololz.summit
Connect for Lemmy: https://play.google.com/store/apps/details?id=com.kuroneko.lemmy_connect
Boost for Lemmy: https://play.google.com/store/apps/details?id=com.rubenmayayo.lemmy - (Upcoming)
Sync for Lemmy: https://syncapps.io/ - (Upcoming)
Slide for Lemmy: https://github.com/bqv/slide - (Upcoming)
Lemmy-fennec: https://github.com/nick-delirium/lemmy-fennec
Ares: https://github.com/lyptt/ares - (Upcoming)
Warami: https://github.com/mdpearce/warami - (Upcoming)
Lemmur: https://github.com/LemmurOrg/lemmur - (Not maintained, I think?)
Lemming: https://github.com/janniskilian/Lemming - (Upcoming)
Wefwef: https://wefwef.app - (Web App)
Can’t quite recall how long I was on Reddit for, but I joined very early on. Maybe 14 or 15 years old, my account was? Reddit had been getting rubbish for years, possibly the last 6 or 7. I needed this push, and something about Lemmy reminds me of old Reddit. How it was in the early days. Yes, Lemmy does have some work to do, but I don’t think it needs to be as popular as Reddit. Let people use other sites too. Way too much in-fighting and faux-drama on Reddit. Hopefully, Reddit traffic will be split between three or four sites. This may stop many of the stupid clashes.