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FWIW, JSON5 and Hjson share those goals.

https://hjson.github.io/

See JWCC (JSON With Commas and Comments) https://nigeltao.github.io/blog/2021/json-with-commas-commen...

I'm not sure if it comes from a plugin or not, but that's one of the options I have in VSCodes language dropdown, JSON with comments, and it's exactly what the name says, it's json, but it doesn't die on // style comments. It also kicks in if I name the file with .jsonc as the extension.

Or just use TOML when it's appropriate; that's what I do, and I haven't had cause to regret it.

One can usually answer the question "am I going to frequently have deeply-nested tables and/or long strings for keys" in advance, and if the answer is no then TOML is practically ideal. If it proves to be wrong occasionally than JSON is a reasonable fallback, as is just coping with the verbosity of TOML.