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I think KYAML[1] is very relevant here. KYAML is a strict subset of yaml[2], supported natively by kubernetes tooling in most recent versions.

In my opinion it's closer to JSON with comments than to YAML, but overall it looks like a pretty nice format, that solves some of pain points of both technologies. This is not the first nor the only JSON-with-comments format, so I wonder if it manages to break out of kubernetes world and become popular.

[1] https://kubernetes.io/blog/2026/08/11/how-to-pretty-print-ku...

[2] https://www.kubernetes.dev/resources/keps/5295/