{
    "custom_math_operation": {
        "message0": "%1 %2 %3",
        "args0": [
            {
                "type": "field_dropdown",
                "name": "OPERATOR",
                "options": [
                    ["+", "ADD"],
                    ["-", "SUBTRACT"],
                    ["*", "MULTIPLY"],
                    ["/", "DIVIDE"]
                ]
            },
            {
                "type": "input_value",
                "name": "NUM1",
                "check": "Number"
            },
            {
                "type": "input_value",
                "name": "NUM2",
                "check": "Number"
            }
        ],
        "inputsInline": true,
        "output": "Number",
        "colour": 230,
        "tooltip": "Perform a mathematical operation",
        "helpUrl": ""
    }
}