If your ring device can appear in /dev/input/eventXX (XX means number for your ring device), you don't need to use kobo-libra2-uhid-module.
If your evtest report is from the Linux of Kobo, the value is hexadecimal. When you use kobo-btpt, you need to convert the value to decimal number.
The ABS_Y is for the location of touching panel, I am not sure whether you can use it in kobo-btpt.
In my experience, the evtest of PC Linux can get more information when you use bluetooth device. You can get the right event, like EV_KEY - KEY_VOLUMEDOWN ...
Then you can use suitable event in kobo-btpt.
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