code: protected function _construct() // @codingStandardsIgnoreLine - required by parent class
      {
          $this->addColumn('backend_name', ['label' => __('Name')]);
          $this->_addAfter = false;
          $this->_template = 'Fastly_Cdn::system/config/form/field/acl.phtml';
  
          parent::_construct();
      }
docs: Initialise form fields
  
  @return void