code: public function decodeValue(DecodePropertyValueForWidgetEvent $event)
      {
          if (!$this->wantToHandle($event) || ($event->getProperty() !== 'jumpTo')) {
              return;
          }
  
          $propInfo = $event->getEnvironment()->getDataDefinition()->getPropertiesDefinition()->getProperty('jumpTo');
          $value    = StringUtil::deserialize($event->getValue(), true);
          $extra    = $propInfo->getExtra();
  
          $newValues = [];
          $languages = $extra['columnFields']['langcode']['options'];
          foreach (array_keys($languages) as $key) {
              $newValue = '';
              $filter   = 0;
              if ($value) {
                  foreach ($value as $arr) {
                      if (!is_array($arr)) {
                          break;
                      }
  
                      // Set the new value and exit the loop.
                      if (array_search($key, $arr) !== false) {
                          $newValue = '{{link_url::' . $arr['value'] . '}}';
                          $filter   = $arr['filter'];
                          break;
                      }
                  }
              }
  
              // Build the new array.
              $newValues[] = [
                  'langcode' => $key,
                  'value'    => $newValue,
                  'filter'   => $filter
              ];
          }
  
          $event->setValue($newValues);
      }
docs: Translates the values of the jumpTo entries into the real array.
  
  @param DecodePropertyValueForWidgetEvent $event The event.
  
  @return void