Earlier quoted context omitted.
I built a RSS feed hydrator just for this. It grabs the basic feed and adds whatever I need to it. Then it generates a new one that I subscribe to on my feed reader.
Have you made this open source? I really want something like this. Bonus points if it lets me add filters, etc. I want to read my local newspaper, but like half of the stories are about high school sports, of which I have absolutely zero interest.
But it's pretty much a bespoke handler for every site with some common bits (caching, feed fetching etc)
For example: the HN handler uses the Algolia API to grab "front page" articles, filters them by score and comment count, grabs the link and gets any opengraph data from the link. Then the feed item contains some context for the linked site + post score + comment count.
This way I can make the decision whether to open it or hit next right in my RSS reader.
I have similar handlers for lobsters, tildes, youtube etc. along with a "meh" attempt of a daily AI generated summary for noisy sites like Verge, Ars Technica etc. who publish a dozen or more articles per day. The system grabs all those, combines the ones about the same subject and summarises the content.
But yea, it's open source. 99% of the stuff I build is public on my Github with a permissive license.