I use https://karakeep.app/ to subscribe to RSS feeds; not only can I view the content in the app, but it also captures the content and stores an archive of it. It uses generative AI to create tags (but also supports full text search of everything archived). You can also create RSS feeds with criteria, with it acting as a bus for your content; perhaps it can enrich your RSS feeds while you continue to use your existing RSS reader. I hope this is helpful for your problem statement.