May I suggest that microblog.pub be added to the catalog? It is a single user Activitypub microblog that looks delightfully bare bones and customisable 
There already is a YNH app on the developer’s sourcehut repo, just waiting to be allowed into the club: ~tsileo/microblog.pub_ynh - sourcehut git
You should ask the upstream maintainer to add microblog.pub to the catalog as well as transfer the app in the YunoHost app repo.
Will do. He writes on the project page that “it is not an official package for now”, so I thought it was pending approval from the YNH maintainers, like getting an Android app on F-droid. Sorry for my confusion.