Expression macro in swiftUI result builder

Using Swift
1

I'm trying to write an macro that will expand into some SwiftUI View. I declared my macro like this:

@freestanding(expression)
public macro FocusedCommandItem<Content : View>(_ inCommandName: String) -> Content = #externalMacro(module: "LZSwiftUIMacrosImpl", type: "FocusedCommandItemMacro")

But when I try to use it like this, I get an error:

var body: some Commands {
    CommandGroup(after: .pasteboard) {
        #FocusedCommandItem("Duplicate")
        ^ Generic parameter 'Content' could not be inferred
    }
}

The code that I want this to expand into will look like:

    Button("Duplicate")
    {
        self.duplicateCommand?.1()
    }
    .disabled(self.duplicateCommand?.0 ?? false)

Is there a way to write the macro declaration so it figures this out?