JavaScript Yii2 Highcharts syntax in function

I want to add an image to the legend of a pie in Highcharts Yii2. See example but I cannot write it into my PHP widget in the labelFormat section.

<? = \dosamigos\highcharts\HighCharts::widget([
  'clientOptions' => [
    'chart' => [
      'type' => 'pie'
    ],
    'legend' => [
      'useHTML' => TRUE,
      'labelFormatter' => "function () {
        return '<img src='http://highcharts.com/demo/gfx/sun.png'/>' + this.name;
      }",
      'itemMarginBottom' => 5
    ],
    ...
?>
Answer:1

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