Modern tools should offer the option to write out JSON (with a proper spec, please). I can definitely see the value of a 'ls' variant that can do this, and I remember people discussing JSON-based shells. But not either/or! For example, the Rust compiler can now be persuaded to write out error messages in JSON.
Modern tools are offering the option to write out JSON. Grepping /usr/share/man and /usr/local/share/man on my macOS system reveals a good dozen or so commands that take JSON as input or generate it as output. (Their man pages generally document the schema, too.) Most of the tools I've written myself also have JSON I/O.
