I mean, it looks alright, but using it is a bit of a pain.

• line breaks (enter key) almost always disappear when typed. though oddly enough, the Japanese keyboard seems to enter them much better...
• you can't select anything through a line break, and selecting anything more than a single word is quite difficult, if not impossible.
• you can't tap the link to the help page for Markdown, as it seems to render through the formatting bar

I'm on Android 12 (build SP1A.210812.016.C1) using Google Chrome (ver. 109.0.5414.85) and Gboard (ver. 2022122600)