{
  "$schema": "https://developer.microsoft.com/json-schemas/sp/column-formatting.schema.json",
  "elmType": "div",
  "attributes": {
    "iconName": {
      "operator": "?",
      "operands": [
        "@currentField",
        "CheckboxComposite",
        "Checkbox"
      ]
    },
    "class": {
      "operator": "+",
      "operands": [
        {
          "operator": "?",
          "operands": [
            "@currentField",
            "ms-fontColor-neutralPrimary",
            "ms-fontColor-neutralTertiary"
          ]
        },
        " ms-fontSize-l"
      ]
    }
  }
}