PhpSpreadsheetのChartにdatatableを表示する

if (($chartType !== DataSeries::TYPE_PIECHART) && ($chartType !== DataSeries::TYPE_PIECHART_3D) && ($chartType !== DataSeries::TYPE_DONUTCHART)) {
    if ($chartType === DataSeries::TYPE_BUBBLECHART) {
        $this->writeValueAxis($objWriter, $xAxisLabel, $chartType, $id2, $id1, $catIsMultiLevelSeries, $xAxis ?? new Axis());
    } else {
        $this->writeCategoryAxis($objWriter, $xAxisLabel, $id1, $id2, $catIsMultiLevelSeries, $xAxis ?? new Axis());
        if ($plotArea->getDataTable()) {//この行を追加
          $this->writeDataTable($objWriter);//この行を追加
        }//この行を追加
    }
    $this->writeValueAxis($objWriter, $yAxisLabel, $chartType, $id1, $id2, $valIsMultiLevelSeries, $yAxis ?? new Axis());
    if ($chartType === DataSeries::TYPE_SURFACECHART_3D || $chartType === DataSeries::TYPE_SURFACECHART) {
        $this->writeSerAxis($objWriter, $id2, $id3);
    }
}

/**
 * Write DataTable
 *
 * @param XMLWriter $objWriter XML Writer
 */
private function writeDataTable($objWriter) {
  $objWriter->startElement('c:dTable');
  
    $objWriter->startElement('c:showHorzBorder');
           $objWriter->writeAttribute('val', '1');
           $objWriter->endElement();
    
    $objWriter->startElement('c:showVertBorder');
           $objWriter->writeAttribute('val', '1');
           $objWriter->endElement();
    
    $objWriter->startElement('c:showOutline');
           $objWriter->writeAttribute('val', '1');
           $objWriter->endElement();
    
    $objWriter->startElement('c:showKeys');
           $objWriter->writeAttribute('val', '1');
           $objWriter->endElement();
  
  $objWriter->endElement();
}

   /**
    * PlotArea Data Table.
    *
    * @var bool
    */	
    private $dataTable = false;

    /**
     * Set Data Table.
     * @param bool $dataTable
     * @return PlotArea
     */
    public function setDataTable($dataTable)
    {
    	$this->dataTable = $dataTable;
    	return $this;
    }

    /**
     * Get Data Table.
     * @return bool
     */
    public function getDataTable() 
    {
    	return $this->dataTable;
    }

    $objPlotArea = new PlotArea($layout1, array($objSeries));
    $objPlotArea->setDataTable(true);//この行を追加