Hello,
I use jsonpath in my vscode extensions as well (https://github.com/mbehr1/dlt-logs and https://github.com/mbehr1/fishbone).
It would be nice if you/we could extract the JSONPath language support into a standalone extension so that we can simply include it.
(I'm currently adding a very basic support copy+pasted from your language config/grammar to my notebook support, see here mbehr1/fishbone#34 )