fx looks to work from the command line (without viewing) to do more than just inspect, looks like you can do pretty much anything to it with a bit of JS, though not from the TUI afaict

There are many JSON viewers, I would think that inspecting with collapsable sections ought to be right in VS Code with LSP/treesitter, no extra tools needed.

What's more interesting to me is what can you do with the JSON in these tools, validate, filter, transform, chain...?