I use this feature DAILY at work, you built something great here. I tend to write in md locally, this makes sharing the work with others easy. Especially to those less plaintext inclined.
One thing I did notice, I can't seem to find a way to set a default codeblock font format. The default font option isn't totally monospaced and so some ascii art looks weird :/
I don't think that has anything to do with your contribution though.
THANK YOU!