Add badge to an object

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Here's my code:

I want to show the badge on the badge on the rectangle each time I press on it. But currently it isn't working what I did wrong?

import SwiftUI
import PlaygroundSupport

struct ContentView: View {
    var body: some View {
        Button(action: {
            badge(9) 
        }, label: {
            Rectangle()
                .frame(width: 180, height: 200)
                .foregroundColor(.blue)
        })
    }
}


PlaygroundPage.current.setLiveView(ContentView())