I have been coming round to supporting comments in JSONtext, at least for ignoring comments on reading (which is quite simple to implement, I think). And possibly features to be more forgiving of common User error, such as missing commas.
It is a really nice format, but I'd recommend using something else in LabVIEW because of lack of support, unless the EM library covers everything you need.
The repo is unmaintained. (source: I'm the author)