That would be a question for the maintainer. One’s config can be structured in many ways: UI-only, which puts it in JSON in internal storage, or various YAML structures.
EDIT: Clarification: Watchman of course works with YAML specifically, so my JSON comment really isn’t relevant. I don’t know how Watchman’s internals work, but I would image it knows which file it is processing. Creating a local link for a browser seems like a security risk.
I cannot speak to this either, but I exclude “entities” specified as defaults or in examples.