@cjkoester kindly reminded me that I created an M language file for the fantastic Crayon Syntax Highlighter wordpress plugin that I use on my site. I’ve made it available on my OneDrive share… simply extract it into your plugins\crayon-syntax-highlighter\langs directory, and you should be good to go.
Like the Notepad++ language file I shared, the highlighting is far from perfect/complete, but it’s a good start. If you improve upon it, please let me know!