How to make onHover events for ComboBox?

I want to make an event for onHover of ComboBox entries, but it’s not included in the UMG code.

I thought I could make it by using a custom widget as list entries, but they just block the normal click events from reaching the ComboBox and the ComboBox becomes unusable. (Your custom widget has to be Hit Test Invisible, which also makes the onHover impossible)

Any ideas?