I have searched the forum for an hour now and couldn't find a solution for my problem (maybe its too simple for you guys

I want to create a report which tells me the total virtual disk size per VM for specific VMs.
Thats working so far with a 'Custom Infrastructure' Report with custom filter for the VM names I need.
But is there a way to sum alle selected VMs up at the end of the Report? It should look like this:
NAME; Virtual Disk: Size Total (GB)
ServerA; 10
ServerB; 20
Sum; 30
Thanks in advance for you help!