Hi, following discussion on the bugtracker, i took a little time to explicit what custom output format support could look like in Zola.
It’s all taking place on a pad following cooperation guidelines proposed on the bugtracker ⁽¹⁾ (these can of course be question and amended).
If something on the pad is not clear please point it out. I intend this draft document to slowly evolve into the actual documentation page about this particular feature.
Feel free to provide constructive criticism and outrage if i missed some obvious issue 
⁽¹⁾ Sorry i can’t post more than two links in a post as my account is new so you’ll have to search the page for “those guidelines”.