Valid JSON but non standard value to given key

curl --location 'https://api.fourkites.com/load/update/dispatcher-api/async' \
--header 'Content-Type: application/json' \
--data '{
    "updates": [
        {
            "timeZone": "UTC",
            "identifierKeys": [
                {
                    "identifier": "Load reference #1",
                    "rawIdentifier": "Carrier format - Load reference #1",
                    "identifierType": "Load reference identifier type in FourKites or Carrier company" //If FourKites standard used, then only reference would be searched using given identifierType otherwise skipped
                }
            ],
            "loadUpdate": [
                {
                    "locationUpdate": {
                        "latitude": {
                            "test": "41.998090"
                        },
                        "longitude": "-87.668700",
                        "locatedAt": "2023-08-27T19:50:00Z",
                        "city": "Chicago",
                        "state": "IL"
                    }
                }
            ]
        }
    ]
}'