FastPages: Track Changes Collaboration with Non-Jupyter Users

I love being able to use fastpages. Of course, it’s great that fastpages supports word, md and notebook based inputs. My situation is possibly unique, which is that I am collaborating with someone who is used to working in word, but I am blogging in jupyter. I don’t want to give up the amazing capabilities of jupyter, but I also don’t see great tools for collaborating with people who don’t know about git and jupyter. Is anyone aware of solutions that deliver the Microsoft Word style “track changes” type capabilities, or just a tractable workflow for collaborating with people who don’t know git and jupyter and markdown?
Note: I tried converting my blog from markdown to word using pandoc, and the main issue there is that we end up editing on something that the edits need to be manually transferred back to the original input notebook. Thanks in advance.