code: public function execute()
      {
          $result = $this->resultJson->create();
  
          try {
              $aclId = $this->getRequest()->getParam('acl_id');
              $aclItems = $this->api->aclItemsList($aclId);
  
              if (is_array($aclItems) && empty($aclItems)) {
                  return $result->setData([
                      'status'    => 'empty',
                      'aclItems'  => []
                  ]);
              }
  
              if (!$aclItems) {
                  return $result->setData([
                      'status'    => false,
                      'msg'       => 'Failed to fetch acl items.'
                  ]);
              }
  
              return $result->setData([
                  'status'    => true,
                  'aclItems'  => $aclItems
              ]);
          } catch (\Exception $e) {
              return $result->setData([
                  'status'    => false,
                  'msg'       => $e->getMessage()
              ]);
          }
      }
docs: Get all ACL entries for active version and current ACL
  
  @return $this|\Magento\Framework\App\ResponseInterface|\Magento\Framework\Controller\ResultInterface