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3

The place to look is the Metadata API Developer Guide, in the Metadata Types section. Note on terminology: these are not Custom Metadata Types. Custom Metadata Types are a specific Metadata API entity. CustomObject, for example, is a built-in Metadata API entity.


2

I'm not aware of such an API, or any other way of extending standard metadata like this. I think you might be forced into: Storing the values you require as some Custom Metadata Type, with a 'Key' field that holds the Object and Field API names for querying. Storing the values in some global utility class, with each JSON string being a value in a Map of <...


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