Fieldset element -> class

Need Help
1

Is it possible to add a class to the fieldset element?

        <?= $this->Form->fieldset($inputs, [
            'legend' => 'label',
            'class' => 'js-fields',
        ]); ?>

Its doesnt work…

2 
  <?= $this->Form->fieldset($inputs, [
    'legend' => 'label',
    'fieldset' => [
      'class' => 'js-fields',
    ]
  ]) ?>
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