Djot support?
I recently learned about Djot which is derived heavily from CommonMark but has more features and is generally like a stricter Markdown. It's by John MacFarlane who is also behind Pandoc so the conversion is well-supported would look something like this:
djot -t pandoc mydoc.dj | pandoc -f json -s -t gfm -o mydoc.md
I'm incredibly interested in trying this out for authoring my blog content.