Battery level on Roccat Burst Pro Air?

Hi everybody, I recently got a Roccat Burst Pro Air which has a battery in it since its wireless.

The problem here is that I cannot see the battery level on upower by any means because I think it never was developped for linux as roccat does not support linux for its devices (don't know if its in the kernel or in upower itself?).

I'm not a driver developer but a web developer. Maybe I can try to support this device in order to expose the battery level. But I don't actually know where to start.

Can anyone guide me?

Thank you in advance!