How do I implement a _global_ copy command for my app?

I would like to implement a global copy command for my app. The code below is an attempt at achieving this but does not work.

Code Block 
struct ContentView: View {
  @State private var name = ""
  
  var body: some View {
    VStack {
      Text("Hallo \(name)")
      TextField("Please enter your name", text: $name)
    }
    .onCopyCommand(perform: {
      print("You got to onCopy")
      var items = [NSItemProvider]()
      let stringData = "Hallo \(name)".data(using: .utf8)!
      items.append(NSItemProvider(item: stringData as NSData, typeIdentifier: kUTTypePlainText as String))
      return items
    })
  }
}

When the user selects something in the TextField, then using the copy menu should copy that text to the clipboard but when it has nothing selected, then I want to copy "Hallo" and the name to the clipboard.

As you can see, I tried using the onCopyCommand but Copy is always grayed out.

Any ideas on how I can enable Copy on the menu, and handle it when the TextField does not have anything selected?