Query by content reminds me of XPath, so I looked it up to see if there was a version for JSON...
Turns out there is https://www.ietf.org/archive/id/draft-goessner-dispatch-json...
Turns out there is https://www.ietf.org/archive/id/draft-goessner-dispatch-json...
[1] https://www.rfc-editor.org/info/rfc6902