plugin musescore 3.6.2

I am using a Stafftext(rigth-click properties-change channel) to assign different voices to different channels (for examples with "men" or "woman"-instrument, who have two channels assigned to them). I created some instruments to assign each of 4 voices to a different channel. Sometimes i need all four so all 4 voices can be assigned to a different channel.

I can see in the in the mscx-file (xml) that this action creates (1 or more) "channelswitches", but i cannot find how to check this "channelswitch" in a plugin.

I tried detecting this with the "element analyser"-plugin but i could not find the channelswith or something that looks like it. (i chose "all").

I am creating a plugin for making practice-movies(mp4) for the choir i am singing in(SSAATTBB).

The question:
It would be usefull if i could check if the "channelswitches" are filled in properly. Thus the voices correctly "switched" to the channels.
Help would be greately appreciated!

Harrie.