An app that is open source and can extract the page content in a simplified “Reader Mode”.
Wallabag might work.
Nextcloud’s news reader is pretty good – but you need to host a Nextcloud instance first :) (Hint: you should, to free yourself from google/icloud or whatever you use)
https://lemmy.ca/c/selfhosted@lemmy.world
https://github.com/nextcloud/news
Desktop and mobile clients are available.
This might not fit your workflow, but Thunderbird can be used as an RSS reader. Go to File > New and add a new Feed Account
I was hoping for this to work but it doesn’t parse the full content. Weirdly also it didn’t import correctly the opml file, the folders where there but they didn’t have the rss link.
Can’t go wrong with Fluent Reader. It’s beautiful and featureful, has a reader mode as well.