{
  "$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
  "elmType": "img",
  "attributes": {
    "src": "=@currentWeb + '/Shared Documents/Evilness/' + @currentField + '.png'"
  },
  "style": {
    "width": "64px",
    "height": "64px"
  }
}