code: public function saveAdditionalFields(array $submittedData, \TYPO3\CMS\Scheduler\Task\AbstractTask $task)
      {
          /** @var $task \Causal\ImageAutoresize\Task\BatchResizeTask */
          $task->directories = trim($submittedData['scheduler_batchResize_directories']);
          $task->excludeDirectories = trim($submittedData['scheduler_batchResize_excludeDirectories']);
      }
docs: Saves given string value in task object
  
  @param array $submittedData Contains data submitted by the user
  @param \Causal\ImageAutoresize\Task\BatchResizeTask $task Reference to the current task object
  @return void