Local check (Windows, bat file) specification of bytes

For our organization we have a custom application.
For this application we want to show a metric in CheckMK, this metric from our application will be outputted in bytes. But it is a long number. The CheckMK graph shows it as something like:
1.07e+15

Can we manage to specify that the provided value is in bytes, so CheckMK can convert it to GB in the graph?

The check created by our app looks like:
@echo off
echo 0 ‘Used bytes’ bytes=1072225449266724 Bytes in use

I have tried to append different formats at the end (bytes, B, b), but that doesn’t seem to work.