I did look through all of the Kotlin sample projects, and many of the Java samples as well and did not see examples of @IBOutletCollection specifically. If you know of a project that uses it, could you point me there?
To clarify, I have been able to get @IBAction and @IBOutlet working. Those have examples and are very straightforward. @IBOutletCollection seems to require a different usage that I cannot find. I see that the annotation is included in the library, I just cannot find how to use it.