{
    "expr": "Phone{type: $join(number, \", \"), \"phone\":number}",
    "dataset": "dataset1",
    "bindings": {},
    "result": {
        "home": "0203 544 1234",
        "phone": [
            "0203 544 1234",
            "01962 001234",
            "01962 001235",
            "077 7700 1234"
        ],
        "office": "01962 001234, 01962 001235",
        "mobile": "077 7700 1234"
    }
}