Read HDMI CEC Connected Inputs

I have implemented some rules that automatically adjust the settings on my Denon AVR receiver based on the selected application of my LG webOS tv. This works fine for the most part, but there are several devices connected to the AVR, using the CEC

The TV is perfectly capable of separating these devices, but the WebOS binding channel for the application is just reporting out “HDMI2”.
from this link I learned that within the application there is such a thing as a SubList to identify different devices that are connected on the same HDMI port using CEC.

is there a way to extract this from the webOS, too by expanding the binding?