[mhio]

nushell and powershell use the concept of "output as typed data".

nushell has typed parameters as well, but nushell fell over for me where the built ins didn't provide some simple functionality coreutils do (admittedly a while ago now)

I'm sure I've run into a project (in python?) that wraps common gnu utils for json output like you describe as an interim step for command that don't support a `--output=json` like option. My search-foo is failing me though...