In the standard email template, the sale.report_saleorder report is automatically added, when sending a sale.order via mail.

I want to add another report that is being generated automatically. 

I though of two ways how this might be possible, but i dont know how to do it, please help me

- I could either addd a second report to the template (if possible) - this would be the preferred way

- I could modify the original sale.report_saleorder report by inheriting it and adding a second page with my report 

What is the best way to do this and how do i do it?

Image to help explain what i want to do:

Thank you very much for helping.