How to Detect the Retina Display for macOS in SwiftUI

In Cocoa, you can find out whether or not you have a Retina screen with the backingScaleFactor property like the following.

func getWinFactor() -> CGFloat? {
	if let view = self.view.window {
		let factor = view.backingScaleFactor
		return factor
	} else {
		return nil
	}
}

How could we detect whether or not the application is dealing with a Retina screen in SwiftUI? I thought the displayScale Environment property is the chosen one. But my 27-inch iMac with a Retina display will return the scale as 1.0.

import SwiftUI

struct ContentView: View {
	@Environment(\.displayScale) var displayScale

	var body: some View {
		VStack {
			...
		}
		.onAppear {
			print("display scale: \(displayScale)") // Returning 1.0
		}
	}
}

Do I miss something with this environment guy? Muchos thankos.