Collab Viewer Template - Add new option in Interaction Menu

I am trying to add a new option (like Explode, Xray, Transform etc) in interaction menu in the Collab Viewer.

But I am unable to find the blueprint where I can do so. I found the Option Button Array in blueprint but I have no idea where and how this array is being filled or where the defauly values are set.

I even saw this video ( which goes about extending the template - But they only add the sub menu option (for Xray component) – I am looking to add a new menu option – any pointer would be helpful. Thanks