image2.vl

{
    "mark": {
        "height": 25,
        "width": 25,
        "type": "image"
    },
    "data": {
        "values": [
            {
                "img": "https://vega.github.io/vega-lite/data/ffox.png",
                "x": 0.5,
                "y": 0.5
            },
            {
                "img": "https://vega.github.io/vega-lite/data/gimp.png",
                "x": 1.5,
                "y": 1.5
            },
            {
                "img": "https://vega.github.io/vega-lite/data/7zip.png",
                "x": 2.5,
                "y": 2.5
            }
        ]
    },
    "$schema": "https://vega.github.io/schema/vega-lite/v4.json",
    "encoding": {
        "url": {
            "field": "img",
            "type": "nominal"
        },
        "x": {
            "field": "x",
            "type": "quantitative"
        },
        "y": {
            "field": "y",
            "type": "quantitative"
        }
    }
}