I don’t know if this is compatible with your use case, but as a working scientist interested in my sub field and those adjacent, I subscribe to email alerts fro

I don’t know if this is compatible with your use case, but as a working scientist interested in my sub field and those adjacent, I subscribe to email alerts from publishers (all nonprofit scientific societies with the exception of Nature). There are both table of contents emails and keyword-based emails. Not sure if RSS feeds are available. If you’re wanting to do some automated parsing, you might need a dedicated email address (and of course access through a university library or similar).