Sticky item divider focus event?

I’m grouping “Parties” on a page, I’m using ion-item-divider sticky to separate them by X.
I want to (ngModel) a property on my class whenever X sticky is the one on top.

Is it possible? If so, how?

Not easy, as I don’t believe there is any inherent event emitted when position: sticky things stick or unstick. If I were tasked with doing this, I would look into writing a directive based on the ideas in this article.