Seems like a good place to plug: https://codeberg.org/neo1/mkebook https://codeberg.org/neo1/mkebook it's a bash script front end for curl-cffi -> pandoc i.e.

Seems like a good place to plug: https://codeberg.org/neo1/mkebook https://codeberg.org/neo1/mkebook it's a bash script front end for curl-cffi -> pandoc i.e. impersonate web-browser to download url, then convert to epub. There is also the option to use chromium for the scraper or ebook-convert for the converter. Some config and you have a (rss reader) newsboat -> calibre with a hotkey.