Dune for vscode
This tmLanguage could also be used in other editors (textmate, sublime text) but I didn't write a package/extension specifically for them; feel free to pick the tmLanguage for any other editor! Github source is here.
If you to fix the syntax file
to compile yaml into tmLanguage. The JSON-tmLanguage is also generated in case it can help for adding syntax support to an other editor.
To debug the syntax highlighting, you can use the command Developer Tools: Inspect TM Tokens.