Unclear webhook eventNotification documentation

There are several conflicts in the docs about the eventNotification object in the envelopeDefinition type.

First
https://developers.docusign.com/docs/esign-rest-api/reference/Envelopes/Envelopes/create/#eventNotification
Shows the following

{
  eventNotification:eventNotification{
    eventData:connectEventData{
      format:String,
      version:String,
      includeData:Array
    }
  }
}

while
https://apiexplorer.docusign.com/#/esign/restapi?categories=Envelopes&tags=Envelopes&operations=create
shows

{
  eventNotification:eventNotification{
    connectEventData:undeclared_type{
      format:String,
      version:String
    }
  }
}

It is unclear which of these is correct.

Secondly
https://developers.docusign.com/docs/platform/webhooks/connect/architecture

Very heavily implies that a valid version and format would be v2.1 and JSON, however after many combinations I’m only ever able to get XML back. I was unable to find any place in the docs that list out the allowed versions and formats.

Lastly
https://developers.docusign.com/docs/platform/webhooks/connect/configuration
Is not what is shown at
https://admindemo.docusign.com/connect/edit-custom?accountId=

The questions that arose because of this are:

Is there some doc that I just missed in my exploration? If not then an answer to the following would be greatly appreciated.

What are valid format, version and includeData values?

Is the name of the object containing those fields eventData or connectEventData?

Does the webhook support any format other than XML?

"eventNotification": {
    "url": "https://example/EventNotifications",
    "loggingEnabled": "true",
    "requireAcknowledgment": "false",
    "envelopeEvents": [{
            "envelopeEventStatusCode": "sent",
            "includeDocuments": "false"
        },
        {"envelopeEventStatusCode": "delivered"},
        {"envelopeEventStatusCode": "completed"},
        {"envelopeEventStatusCode": "declined"},
        {"envelopeEventStatusCode": "voided"}
    ]
}