What is componentInstanceId and how to use it

I have discovered outputs[“Receive event”].componentInstanceId and I was wondering of what it is and how to use it.
Can’t find anything in the Docs about it.

To me it looks like an overview of IDs and indexes of elements at a page.
Looks like

And by using SPLIT with : you get some maybe useful data:

In a nested list it seems like you can get indexes from elements in a nested tree.
[3] = 0 > index of Root of list
[5] = 1 > index of tapped element.

Just wondering if it can be used like this or to something else?