Defining Records with narrowed keys

I couldn't find a way in the docs on object types (https://arktype.io/docs/objects) to define a record with narrowed keys. For example keys with no special symbols in them:

BAD

{
  "$userName": "bob"
}

{
  "$userName": "bob"
}

GOOD

{
  "userName": "bob",
}

{
  "userName": "bob",
}

Seems like there should be a way, but I haven't been able to locate it.

ArkType

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Defining Records with narrowed keys

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