namedaxisrange.vl

{
    "$schema": "https://vega.github.io/schema/vega-lite/v4.json",
    "data": {
        "values": [
            {
                "c": "#ff0000",
                "col": "X",
                "l": "A"
            },
            {
                "c": "#0000ff",
                "col": "Y",
                "l": "B"
            }
        ]
    },
    "encoding": {
        "color": {
            "field": "l",
            "scale": {
                "range": {
                    "field": "c"
                }
            },
            "type": "nominal"
        },
        "y": {
            "field": "col",
            "type": "nominal"
        }
    },
    "mark": "circle"
}