Missing Function: OutputChannel - Get Channel Key

[HpLightcorner]

Issue
I am adding and deleting output channels dynamically (or to be more precise - according to a setup-file) to my plugin. I want to compare to the unique-channel key, and if the present channel key was removed from the settings file, I am going to delete the output-channel in oxygen as well. To do so, I need the INSTANCE_CHANNEL_KEY property.

My current source code looks like this:
const auto& key_property = std::dynamic_pointer_cast<EditableStringProperty>(channels_to_question[i]->getProperty("SoftwareChannelInstanceKey"));

as the INSTANCE_CHANNEL_KEY is defined private in odkfw_software_channel_instance.cpp.

Suggested Solution
Add a function to PluginChannel allowing to get the INSTANCE_CHANNEL_KEY property. Alternativly, make INSTANCE_CHANNEL_KEY a global, public define.