In this case, I would imagine two scenarios

1. I have markdown, I want a docx version, that is equivalent to html rendering, markdown's whole point, almost certainly many options out there

2. I have docx, I want to make edits in markdown (because vim motions), need to sync those edits back. Ideally just some value swaps in the "DOM"

It may very well be the case that Office now supports Markdown natively. I seem to recall possibly seeing that. Google Workspace is as well iirc. One of the two already had support, the other was just releasing the first takes (back when I last looked )