Are there conventions for signing JSON as a tree, to allow proofs of signed subtrees?

Question

Given some JSON with a chosen encoding, you can obviously cryptographically-sign the whole thing as a binary blob.

However, it might be useful if the logical structure of the JSON-compatible object were leveraged to control what is signed, in such a way that you could later provide compact proofs that some subtree of the JSON object was signed (without necessarily providing the full JSON object).

For the purposes of illustration, assume the JSON object is a large dictionary, mapping short names to longer blobs, as might be constructed by the following Javascript.

json = { 'A': 'rfhserusliurslierfsieursiuebr',
         'B': '384ur3984hfe98r9e8hjf8ej4fj04',
         ...
         'Z': 'xcvubxudgoxduhf9xd88hxd9fybdf',
}

I'm hoping for some robust deterministic convention, already hammered out in a mature spec, for providing a "signature" of this object that does more than a plain signature-of-its-JSON-serialization.

Then, consider a 3rd party that has that signature, plus the full JSON, but only wants/needs to show that the original signer signed something containing:

subset = { 'B': '384ur3984hfe98r9e8hjf8ej4fj04', }

I'm hoping the convention also specifies how this 3rd party can construct a combination of that subset, the signature, and something else about the elided ranges – that still proves the original signer committed to just that subset.

It seems this might already exist – if not already for JSON, then for some other similar hierarchical object model.

One natural approach that 1st comes to mind would involve composing the keys/values/slots of the entire object into a hash tree, and then signing the root. With suitable tricks, this might allow the 3rd party to prove any subset, like the one above, in a compact (or even fixed-size) way. (But maybe there are other techniques, involving composable signatures, zk-proofs, redactable-hashing, etc - the goal is more important than the mechanism.)

Does anyone know of applicable conventions/standards/published-techniques? Just names or references of related prior work, for further searching/reading, would be great answers.