OnComponentEnd Overlap Issue

Another Related Question - I need the Widget Popup to show different values for each instance of BP_Building added in the Landscape (which will be a public variable defined in BP_Building). How do I add that Variable Input before “Add to Viewport” node here in the “On Component Begin Overlap (Box)” node?

With the current Blueprint screenshot shown above - it will display sample value for all the instances of Building, which I would need to change to a variable. Widget screenshot is attached, which is simple one with just one Text Box.