getBulkOptions example

'#type' => 'radios',
      '#title' => $this->t('Available actions'),
      '#options' => [
        'exclude' => $this->t('All actions, except selected'),
        'include' => $this->t('Only selected actions'),
      ],
      '#default_value' => $this->options['include_exclude'],
    ];
    $form['selected_actions'] = [
      '#type' => 'checkboxes',
      '#title' => $this->t('Selected actions'),
      '#options' => $this->getBulkOptions(FALSE),
      '#default_value' => $this->options['selected_actions'],
    ];

    parent::buildOptionsForm($form, $form_state);
  }

  /** * {@inheritdoc} */
  public function validateOptionsForm(&$form, FormStateInterface $form_state) {
    parent::validateOptionsForm($form, $form_state);