I have gotten full access to the JSON array through the following steps:
1) Catch a raw webhook
2) Send the webhook data to a Code by Zapier step
3) Start with the following code and output the values you want to use.
var obj = {},
data = JSON.parse(inputData.data); //Data will now function like a json object
//Pull out your values
obj.value = data.user_column_data[1].string_value
return obj;