We had a customer ask the following:

We’d like to report on how much network data each application is using as we suspect that Microsoft Teams is using a lot of data.

Seems like a simple request, Microsoft provides that information in the Advanced network setting –> Data usage page.
Screen shot of Data usage page

The first question I asked was “Can we get to the data via PowerShell?  Or even an API?”

After some investigation, the answer was No.

Okay then, where is the information stored?

In the Windows “System Resource Utilization Monitor” database.

Once you know that, you can then find references, and possible solutions like: