Do you refer to adding tenant's description into the Cloud Connect user report? Your use case makes sense, but it might not be the best place to put this data. Since you're service provider, have you see Veeam Managed Backup Portal
(a new product built for MSPs) that already has this field added to the billing engine?
On second thought, maybe it would be possible to add this capability into our custom backup reporting engine (coming in v9.5). We will discuss this internally and will see what we can do.