Add, delete or replace text in articles

[miltuss]

I want to use a tool that does all three of these things (adding, deleting, or replacing text in articles) on RSS feeds. I filter articles directly in TTRSS via the "Filters" tab. I'm looking for an OpenSource alternative to this https://help.rss.app/en/articles/11178672-how-to-replace-text-in-rss-feeds

Is it possible to replace, add or delete text in RSS feeds with a tool?

If possible, how can we accomplish each of these tasks?