org-sync [0] is all that I could find when I went to look into this last week. It does not have all the functionality that I would want (e.g. comments should be

org-sync [0] is all that I could find when I went to look into this last week. It does not have all the functionality that I would want (e.g. comments should be begin_src markdown blocks), but could serve as a start for something more, and it might meet your needs as is. 0. https://github.com/arbox/org-sync https://github.com/arbox/org-sync