@freemo My sites are in a SQLite database, created by Publii, which creates clean HTML when I output the site. Nothing markdown about it.
This does not sound like an easy transfer, then. Thank you for the information.
I'm not focussing on the Fedipage part for anything at the moment. If I can't make Hugo work for me 'as is' (including importing my existing sites), then that route is not happening.
It might be interesting for a new site I could set up. But that's not in the books yet.