Puts a darker background over your SwiftUI Views with a mask that cuts out a hole for your currently selected view.
Selected view can be chosen by specifying an identifier for your view via modifier. It is then passed to withHighlightOverlay as a binding.
The view coordinates are then tracked using PreferenceKey to maintain correct position for the cutout.
Black circle has an empty identifier which is used to remove the overlay. This example contains an animation for the highlight which can be easily removed if needed.