/**
  * {@inheritdoc}
  */
 public function buildOptionsForm(&$form, FormStateInterface $form_state)
 {
     parent::buildOptionsForm($form, $form_state);
     $form['summary']['human'] = ['#title' => $this->t('Display list value as human readable'), '#type' => 'checkbox', '#default_value' => $this->options['summary']['human'], '#states' => ['visible' => [':input[name="options[default_action]"]' => ['value' => 'summary']]]];
 }