{
    "model": {
        "type": "composite",
        "models": [
            {
                "type": "condition",
                "property": "custom_model_data",
                "index": 0,
                "on_false": {
                    "type": "model",
                    "model": "sword:item/ring_effect"
                },
                "on_true": {
                    "type": "empty"
                }
            },
            {
                "type": "model",
                "model": "sword:item/spark_head"
            }
        ]
    }
}