SwiftUI : Show map marker on center of map & drag to get the coordinates

Question

In swiftui, I want to show a map view with a marker to a specific location aligned with the map's center. when I move the map, the marker also needs to move to get the location of the specific point. I tried the below code but the map moves and the marker doesn't. is there any solution

struct MapView: View {
    @ObservedObject var appTheme: AppTheme
    
    struct MapMarker: Identifiable {
        let id = UUID()
        var coordinate: CLLocationCoordinate2D
    }
    
    @State private var markerCoordinate = CLLocationCoordinate2D(latitude: 37.7749, longitude: -122.4194)
    @State private var mapCoordinate = CLLocationCoordinate2D(latitude: 37.7749, longitude: -122.4194)
    @GestureState private var translation: CGSize = .zero
    var body: some View {
        VStack {
            Map(coordinateRegion: .constant(MKCoordinateRegion(center: mapCoordinate, span: MKCoordinateSpan(latitudeDelta: 0.05, longitudeDelta: 0.05))),
                showsUserLocation: true,
                userTrackingMode: .constant(.follow),
                annotationItems: [MapMarker(coordinate: markerCoordinate)],
                annotationContent: { item in
                MapPin(coordinate: item.coordinate, tint: .red)
            })
        }
        .gesture(DragGesture()
            .updating($translation) { value, state, _ in
                state = value.translation
            }
            .onEnded { value in
                let offset = value.translation
                let translation = CGSize(width: offset.width / 1000, height: -offset.height / 1000)
                mapCoordinate = CLLocationCoordinate2D(latitude: mapCoordinate.latitude + translation.height, longitude: mapCoordinate.longitude + translation.width)
                markerCoordinate = mapCoordinate
                print("New Marker Coordinate: \(markerCoordinate)")
            }
        )
        .onAppear {
            print("Initial Marker Coordinate: \(markerCoordinate)")
        }
    }
}