Adding each snippet line by line to the json file is really not ideal...
Would there be something against moving to a system where lines are not split ?
Even generating the snippet with a command line or something like this...

Two options are a script, to which we could pass the language, the category and the code of the snippet (code passed from a file maybe ?)
The other option would be to modify the storage and use something else than json, something more adapted to multiline string value.

I would like feedback on this before proposing a PR with an implementation.