JSON Ontology Re: Toward easier RDF: a proposal

As I am sure you know, there is a wide proliferation of JSON on the web
Yet (in 2019!) we do not have a standard way for developers, and automated
tools, to map a JSON predicate into a URI
I've suggested in the past :
foo -> urn:string:foo
But that has yet to gain mind share. Tim has suggested we have an HTTP JSON
ontology. So, possibly that is the way to go. Reason being that a random
URI is hard to gain consensus on. But if someone goes to the effort of
creating a JSON HTTP URI you are unlikely to get two of them.
Two issues
1. Wouldnt there be a huge number of terms in a JSON ontology -- should we
maybe dynamically create entries?
2. Where would it be stored? w3.org ? w3id? somewhere else.
If we can reach a consensus on this, I would seem that would be a way to
bootstrap a lot of the existing web?