SwiftUI has no way to remove Toolbar bottom border

SwiftUI has no way to remove the bottom border line at the moment.

In the past, developers can use the UIKit to work around it. See stackoverflow 1 and stackoverflow 2.

Following sample code works if we use the old navigation view and title.

import SwiftUI
struct TestView: View {
    init(){
        let appearance = UINavigationBarAppearance()
            appearance.shadowColor = .clear
            UINavigationBar.appearance().standardAppearance = appearance
            UINavigationBar.appearance().scrollEdgeAppearance = appearance
    }
    var body: some View {
        NavigationView{
            ScrollView{
                ForEach(0 ..< 20){ num in
                        Text("Num - \(num)")
                        .padding()
                }
            }
            .navigationTitle("Learn")
        }
    }
}
 
struct TestView_Previews: PreviewProvider {
    static var previews: some View {
        TestView()
    }
}

However, as soon as we begin to use toolbar related modifiers, the trick will no longer work. I guess it is because the old navigation view uses UIKit behind the scene but toolbar does not.

import SwiftUI
 
struct ToolbarBorderTest: View {
    
    init(){
        let appearance = UINavigationBarAppearance()
            appearance.shadowColor = .clear
            UINavigationBar.appearance().standardAppearance = appearance
            UINavigationBar.appearance().scrollEdgeAppearance = appearance
    }
    var body: some View {
        NavigationView{
            ScrollView{
                ForEach(0 ..< 20){ num in
                        Text("Num - \(num)")
                        .padding()
                }
            }
            .toolbar {
                ToolbarItem(placement: .principal) {
                    Text("Toolbar title (Inline)")
                        .foregroundColor(.blue)
                        .font(.headline)
                }
            }
            .toolbarTitleDisplayMode(.inline)
            .toolbarBackground(Color.white, for: .navigationBar)
            .toolbarColorScheme(.light, for: .navigationBar)
        }
    }
 
}
 
#Preview {
    ToolbarBorderTest()
}

Is this something that SwiftUI will support in the future?