the new #Preview macro does not support it but you can go back to the PreviewProvider struct and achieve exactly what you want:

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
            .previewDevice(PreviewDevice(rawValue: "iPhone 16"))
            .previewDisplayName("iPhone")
        
        ContentView()
            .previewDevice(PreviewDevice(rawValue: "iPad Air 5"))
            .previewDisplayName("iPad")
    }
}