I've spent ages trying to get an RSS feed for changes to a particular file (on the main branch) out of fossil. I can't tell if I'm misunderstanding some fundame

I've spent ages trying to get an RSS feed for changes to a particular file (on the main branch) out of fossil. I can't tell if I'm misunderstanding some fundamental organizing principle, or if RSS feeds from searches/filtered paths is just so far off the important path that it's missing functionality. Help appreciated! Sadly, though, realizing it got iffy when you strayed from the well-trodden path hurt my opinion of fossil a bit. [Edit] My use case is that I ported pikchr (and lemon) to Go and want to be able to notice changes to both. Like everything from the SQLite folks, pikchr is amazing.