You can Modify the TestStand Report Header and Footer using the TestStand ModifyReportHeader and Modify ReportFooter Sequence File Callbacks.
The attached example uses the Sequential Model and the Report Options have been configured to use the ASCII Text File Report Format.
TestStand 2017 or compatible
When using the TestStand ModifyReportHeader and ModifyReportFooter Callbacks you can write string values to the ReportHeader and ReportFooter parameters. These values will be reflected in the TestStand Report.
Example code from the Example Code Exchange in the NI Community is licensed with the MIT license.
Well done!