NAV 2017 Excel Buffer Header/Footer

Hello everybody,
are there any possibilites to add Header or Footer Information via Excel Buffer to an exported Excel?

Theres a function in Table 370, CreateBookAndOpenExcel, Parameter ReportHeader. But thats only a centered Report Header. I need a left and a right header.
Are there possibilities? Tips and tricks?

Further I have to set a page margin, no clue how to do this...

Thanks for your help.
BKR