You can create this report under GUI Monitor > Manage Custom Reports.
Database- Traffic summary
Time Frame: as required
Selected columns: Add Source zone ( tunnel zone), Destination zone, (other required parameter want to be displayed in the report)
>> Click into "run now" and save it as PDF/CSV/XML.
It would be the source zone of global protect's tunnel interface. Its a good practice to have global protect in a separate zone not interfering with your trust/untrust. In case this zone is also used by another interface, then you will see more traffic not just the one coming from gp but from outside as well.
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