Column Formatting in SharePoint List to show Image in Custom card

columnformattingCustomCardImage.json

{
    "$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
    "elmType": "div",
    "txtContent": "@currentField",
    "customCardProps": {
        "formatter": {
            "elmType": "img",
            "style": {
                "max-width": "250px"
            },
            "attributes": {
                "src": "[$ImageColumn]"
            }
        },
        "openOnEvent": "hover",
        "directionalHint": "rightCenter",
        "isBeakVisible": true
    }
}