Dynamic values in json parsing with GWT

I have a json response like this

{"columns": ["a", "b", "c"], "data": {"a": "some value", "b": "some value", "c": "some value"}}

Now here whatever values columns have the same values are used as keys in data object. I have to parse this json in GWT client side. As far as I know JSNI requires fixed json objects. Is there any way to parse this?

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