I think @melvincarvalho has one. He created the SN ~nostr feed on nostr: #178308

edit: Ah, he used this: https://github.com/piraces/rsslay

Seems really simple to put together. Heck somebody extracted the bitcoin mailing list into a bunch of nostr profiles. How did you wan to use it? Care to write a short user story?

Although I feel like RSS is dying, that is one heck of an idea.