How to get the drop target background effect in sidebars on macOS using SwiftUI?

I have a SwiftUI List that's a sidebar on macOS. For its items I have added the dropDesternation modifier like this:

.dropDestination(for: URL.self) { urls, _ in
      for url in urls {
          //... adding urls to destination
      }
}

return true
} isTargeted: { inDropArea in
      if inDropArea {
          highlightedItem = item
      } else {
          highlightedItem = nil
    }
}
       

By default if the cursor is above the item I get no effect, but I want the same effect like using NSOutlineView in AppKit. Here's an example from the Finder:

As you can see I have implemented highlightedItem in the code above. I can use it to check if an item is targeted and draw a background:

 .background {
       if item == highlightedItem {
            RoundedRectangle(cornerRadius: 5)
            .fill(Color.blue)
            .frame(maxWidth: .infinity, maxHeight: .infinity)
       }
}

But that does not look quite the same:

Interestingly the effect I want is the same you get if you use a selection for the sidebar list like: List(selection: $selectedItem)

There must be a native way to do this so I don't have to fake it and get something that does not look quite right.