OpenID Connect User Mapping: how to map a url-namespaced custom claim

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Hello. I’m working with an Open ID Enterprise connection, and trying to figure out how to map a url-namespaced custom claim.

I read through the docs Configure PKCE and Claim Mapping for OIDC Connections

but they don’t mention how to access namespaced custom claims

eg, given a custom claim of “http://www.foobar.com/some_value”

How would I access it from token set?

This is the rough idea of what I’m trying to do (doesn’t actually work due to invalid syntax)

{
  "attributes": {
    "email": "${context.tokenset}['http://www.foobar.com/some_valuel']",
  },
  "mapping_mode": "use_map"
}