This is not possible without fiddling with NPrinting backend.
THOSE STEPS ARE NOT OFFICIAL AND YOU CAN FOLLOW THEM ON YOUR OWN RISK - note you might completly loose your report!!!
Go to NPRrinting admin console --> reports --> open report you want to export
Use Export button to export report and download Zip file
Unzip zip file and go to template folder and take the excel, ppt or whatever template you use from there
Apply all the changes in this file (do not change name of the file!!!)
On your C drive on NPrinitng box find folder which contains apps--> choose app where the template belong to and navigate to template
C:\ProgramData\NPrinting\apps
Replace template and test
cheers
Lech
cheers Lech, When applicable please mark the correct/appropriate replies as "solution" (you can mark up to 3 "solutions". Please LIKE threads if the provided solution is helpful to the problem.