I think TW5-CodeMirror-Enhanced/README_en.md at main · Gk0Wk/TW5-CodeMirror-Enhanced · GitHub is much more powerful and actively is developed now!
See the demo CodeMirror Enhanced — An enhanced for CodeMirror framework in TiddlyWiki
One great feature I like is snippet autocomplete which is customizable!
It has in todolist to support KaTex autocomplete also!