Some random notes app on F-droid probably has what you need. The “Diary” apps there are more like medical/habit trackers/loggers.

Also check IzzyOnDroid repo (select “Writing” category or just search for “Diary”), it has more “modern” apps in my impression.

You will need to scroll through quite a few to find one you like. Just don’t get yourself into choice dilemma, pick one that looks decent and start using it.