AttributedString attributes not implemented

struct WelcomeView : View {
    var text: AttributedString {
        var attributedString = AttributedString("Welcome")
        
        // Apply attributes to the whole string
        attributedString.font = Font.system(size: 16)
        attributedString.foregroundColor = Color.blue
        attributedString.underlineStyle = Text.LineStyle.single
        
        return attributedString
    }

    var body: some View {
        VStack(spacing: 0) {
            Text(text)
                .padding()
        }
    }
}

None of this works in SkipUI.

Unresolved reference 'font'.
Unresolved reference 'foregroundColor'.
Unresolved reference 'underlineStyle'.

Also, AttributedStrings support adding attributes to ranges.

struct WelcomeView : View {
    var text: AttributedString {
        var attributedString = AttributedString("Hello, this part uses a Custom Font!")
        
        let range = attributedString.range(of: "Custom Font")!

        attributedString[range].font = Font.custom("Georgia", size: 32)
        attributedString[range].foregroundColor = Color.blue
        attributedString[range].underlineStyle = Text.LineStyle.single
        
        return attributedString
    }

    var body: some View {
        VStack(spacing: 0) {
            Text(text)
                .padding()
        }
    }
}

This doesn't work either.

Unresolved reference 'range'.

Start by reproducing the two AttributedString examples in SkipUI and trace the Text(AttributedString) entry point. Done means whole-string and range-based font, foregroundColor, and underlineStyle attributes compile and work, including range(of:).