Nice article, again!
If you grab this fix https://github.com/FreshRSS/FreshRSS/pull/5238 (soon in edge), you can export the XPath settings of a feed as OPML by just adding `&a=opml` to the URL (no UI yet), like https://freshrss.example.net/i/?get=f_123&a=opml
Feedback welcome!