I'm using Nextcloud already and that has an officially supported RSS daemon app[1]. I mainly use it with this really good Android client[2] (that's on F-Droid) that supports connecting to it (and Miniflux it appears, which I noticed a bunch of mentions in this thread of).
Probably worth mentioning too since this is HN, of the really nice hnrss[3], which I use for comment notifications in RSS.
[1] https://github.com/nextcloud/news