Hi.
If you mean dynamic content usage in page header there is no way to do this.
But if you want insert compony logo, phone, another contact information, you could use image-header and image-footer. To do this one open file gridPdfGenerator.php and use options:
Option ‘header’ sets path to image to use as header.
Option ‘pageHeader’ show if this header image will be shown on every page (true) or just on a first page (false).
The same rules are correct for $footer and $pageFooter options.