A list of items in an array. Some items in that list are of particular note.
(Say you have 15 items in an array. For whatever reason, such as you not being in control of the expected input structure of whatever you're giving this JSON to, you have them grouped with comments at the top of each block.)
Why would you want to do that in what is basically a human readable binary file and not in a readme?
You seemed to stop at the for who and for what purpose.
I can 'just' about see the case in something like nodeJS package.json files (that is the least of nodeJS's problems, but that's a whole other conversation). But a readme is a so much better option than having to troll through code comments.
The discussion above concerns why JSON isn't a good choice for configuration files. That's exactly because configuration files are not human readable binary files.
