{
    "$schema": "http://json-schema.org/draft-07/schema#",
    "oneOf" : [
        {
            "type": "number",
            "description": "One value for all in the layer"
        },
        {
            "type": "array",
            "description": "Rows",
            "items": {
                "type": "array",
                "description": "Cols",
                "items": {
                    "type": "number"
                }
            }
        }
    ]
}