Currently it is only possible to include some custom header/footer data in an exported Excel worksheet. which is either at the beginning or the end of the rows.
It would be nice to have a feature to set the Excel-Header/Footers from Kendo UI while creating the export file. This Excel headers/footers are only visible when the Excel-Sheet gets printed e.g. you can include Report-Name, creation date or page x of y information.
Have a look at the Header/Footer feature in Excel: Headers and footers in a worksheet - Excel (microsoft.com)