Preview:
//html
<span>Valor da variável: {{nomeVar}}</span>

//JSON

{
    "onLoad": [
        {
            "index": 0,
            "actions": [
                {
                    "set:nomeVar": {
                        "value": "123"
                    }
                }
            ]
        }
    ]
}

//Saída: Valor da variável: 123
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