code: protected function saveItemState()
      {
          if ($this->getRequestParameter('itemDefinition') && $this->getRequestParameter('itemState')) {
              $serviceContext = $this->getServiceContext();
              $itemIdentifier = $this->getRequestParameter('itemDefinition');
              $state = $this->getRequestParameter('itemState') ? json_decode($this->getRequestParameter('itemState'), true) : new \stdClass();
  
              return $this->getRunnerService()->setItemState($serviceContext, $itemIdentifier, $state);
          }
  
          return false;
      }
docs: Save the actual item state.
  Requires params itemDefinition and itemState
  
  @return boolean true if saved
  @throws \common_Exception