The beginnings of one, anyway. Feel free to improve on it, and please let me know if you do.
It provides a bit of syntax highlighting and commenting ability for Elm in BBEdit.
It's nicer to read.
Pop the plist into "~/Library/Application Support/BBEdit/Language Modules/", either by dropping the file there or, if you'd like to stay up to day with changes git clone, e.g.
git clone https://github.com/yb66/BBEdit-Elm-clm "~/The place I keep git projects/BBEdit-Elm-clm"
Then create a link:
ln "~/The place I keep git projects/BBEdit-Elm-clm/HCL.plist" "~/Library/Application Support/BBEdit/Language Modules/"
In both cases BBEdit will require a restart. Files with the extension .elm will automatically be recognised as HCL.
See LICENCE
Anything I've missed or you think could be improved, just let me know.