SwiftUI:如何在列表中居中放置矩形？

import SwiftUI

struct ContentView: View {
    let data = ["Item 1", "Item 2", "Item 3", "Item 4", "Item 5"]

    var body: some View {
        List {
            ForEach(data, id: \.self) { item in
                HStack {
                    Spacer()
                    Rectangle()
                        .frame(width: 100, height: 50)
                        .foregroundColor(.blue)
                    Spacer()
                }
            }
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}