can I get the position of a `View` after layout in SwiftUI?

Use a GeometryReader to get the frame of each view and use the frame to determine the points for a path between the two views.

struct ContentView : View {
    var body: some View {
        GeometryReader { geometry -> Text in
            let frame = geometry.frame(in: CoordinateSpace.local)
            return Text("\(frame.origin.x), \(frame.origin.y), \(frame.size.width), \(frame.size.height)")
        }
    }
}