[APP][Pro] Device Capabilities - Enhance the capabilities of devices

Apps
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1801

Thanks @Peter_Kawa & @Arie_J_Godschalk
This works!

[Above edited based on reply]

So I used indeed:
Calculation: BLL
Calculation BBL expression: $values[0] + $values[1] - $values[2]
BLL expression: [leave empty, so unchanged from default]