code: public function getFieldConfiguration()
      {
          $default = ($this->getSetting('DefaultToToday')) ? $this->getSetting('DefaultToToday') : false;
          $label   = _t('Moo_EditableField.DEFAULTTOTODAY', 'Default to Today?');
  
          return [
              new CheckboxField($this->getSettingName('DefaultToToday'), $label, $default),
          ];
      }
docs: Get extra configuration fields.
  
  @return array