code: public function renderWidget(string $widgetGroup = '', array $widgetId = [])
      {
          $widgets = $this->widgetBuilder->build($this->widgets->getWidgets(), $widgetGroup, $widgetId);
  
          return $this->engine->render($widgets);
      }
docs: Render Widget Group|Item.
  
  @param string $widgetGroup
  @param array  $widgetId
  
  @return string