Can you give more details on "The markdown is not working"? This is the base of the "document" export so it's very important that this has the comments and it would be a bug if that doesn't work. (The JSON and Excel exports are for numerical data so they don't have these).
I can't reproduce the problem, I get the comments in the .md export. Can you share a .kva file with frame comments where exporting to markdown doesn't export them? Are we talking about frame-level comments or labels?

