code: public function getFieldValidationOptions()
      {
          $min = ($this->getSetting('MinValue')) ? $this->getSetting('MinValue') : '';
          $max = ($this->getSetting('MaxValue')) ? $this->getSetting('MaxValue') : '';
  
          return [
              new NumericField($this->getSettingName('MinValue'), _t('Moo_EditableField.MINVALUE', 'Min Value'), $min),
              new NumericField($this->getSettingName('MaxValue'), _t('Moo_EditableField.MAXVALUE', 'Max Value'), $max),
          ];
      }
docs: Get extra validation fields.
  
  @return array