How does one retrieve values from Matrix dataMapping

I am having trouble retrieving the actual values from a matrix data mapping. Below is the current mapping I have specified:

"dataViewMappings": [
    {
        "matrix": {
            "rows": {
                "select": [
                    {
                        "for": {
                            "in": "row"
                        }
                    }
                ]
            },
            "columns": {
                "for": {
                    "in": "column"
                }
            },
            "values": {
                        "for": {
                            "in": "values"
                        }
                    }
        }
    }
]

When I attempt to access my valueSources via

dataViews[0].matrix.valueSources[0]

All my object contains is the following:

However, I do notice that there is a root object on both the rows and columns that contains the values I want (see below)

So, my question is: how do I access the values of the matrix, my actual measures?