This is actually my preferred method of tinderboxing. I have a video on working with markdown, see here: https://www.youtube.com/watch?v=aB_vDL8ezOU.
Here is a simple test file.
TBX L - QDA & Email.tbx (487.5 KB)
Select “Note” and then select File/Export/as Text. Select text file type and then export.
You’ll get a clean Markdown file.
Now, this example is REALLY SIMPLE. I have templates that I’ve developed that will create an extremely nuanced markdown export with automated not numbers, quotes, images, heading formatting etc. I’ve yet to find really any limits.
Also, @sumnerg created an AppleScript to export multiple notes as individual files: Export individual HTML files from agent results - #7 by sumnerg. This can be modified to create .md files.