How to scale text to fit parent view with SwiftUI?

One possible “hack” is to use a big font size and a small scale factor so it will shrink itself:

ZStack {
    Circle().strokeBorder(Color.red, lineWidth: 30)

    Text("Text")
        .padding(40)
        .font(.system(size: 500))
        .minimumScaleFactor(0.01)
     }
}