How to add more column to Excel ouput Test result matrix ?

[maxveneziano]

Hi, I'm using Testlink version 1.9.13.
On the Test result matrix it is possible to export the results in Excel format through an Excel icon on the Title bar.
I need to export in Excel two additional custom fields set during execution.
There is someone that already managed to modify the Excel export present in Test result matrix ?

Thanks in advance

Massimo