public function getHeaderForRender(string $report_name, string $header_name) : array {
		$columns = $this->data[$report_name]['header'][$header_name];
		foreach ($columns as $k => $v) {
			if ($k == 'blank' || empty($v['label_name'])) continue;
			$columns[$k]['as_header'] = true;
			$columns[$k]['value'] = $v['label_name'];
		}
		return $columns;
	}