Table Data Mapping Row Data

I'm trying to get a set of table data in a custom visual following this example.

So my capabilities.json is:

{
    "dataRoles": [
        {
            "displayName": "Values",
            "name": "values",
            "kind": "Grouping"
        }
    ],
    "dataViewMappings": [
        {
            "table": {
                "rows": {
                    "for": {
                        "in": "values"
                    }
                }
            }
        }
    ]
}

But the dataView only produces a node for columns, not for rows.

What am I missing? How can I get the row values?