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Dialogflow CX is there a way to iterate a parameter?

Hello,

Is there a way to iterate an array that you have in paremeter. For example I have an array = [ { "rate_float": 29735.3307, "symbol": "$", "description": "United States Dollar", "rate": "29,735.3307", "code": "USD" }, { "rate_float": 29735.3307, "symbol": "$", "description": "United States Dollar", "rate": "29,735.3307", "code": "USD" } ] in a parameter called test. 

In the agent response I would put $session.params.test[0] to get the first one, but for example I want to iterate and make a response like a list, how should I approach this? With a custom payload?

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