有没有办法设置fullScreenCover背景的不透明度？

struct ContentView: View {
    @State private var isFullScreenCoverPresented = false
    
    var body: some View {
        Button("Present Full Screen Cover") {
            isFullScreenCoverPresented.toggle()
        }
        .fullScreenCover(isPresented: $isFullScreenCoverPresented) {
            FullScreenCoverView()
                .background(Color.black.opacity(0.5)) // 设置背景的不透明度
        }
    }
}

struct FullScreenCoverView: View {
    var body: some View {
        Text("Full Screen Cover")
            .font(.largeTitle)
            .foregroundColor(.white)
    }
}