How to select default font in a font picker?

The default font seems to be .AppleSystemUIFont based on UIFont.preferredFont(forTextStyle: .body).familyName. How can it be selected in a UIFontPickerViewController so that users can revert back to the original default font?

import SwiftUI

class FontPickerViewController: UIViewController, UIFontPickerViewControllerDelegate {
    var isPickerPresented: Binding<Bool>?
    var onFontPick: ((UIFontDescriptor) -> Void)?
    
    override func loadView() {
        super.loadView()
        
        let button = UIButton(type: .system)
        button.titleLabel?.font = UIFont.preferredFont(forTextStyle: .body)
        button.setTitle("Choose font", for: .normal)
        button.addTarget(self, action: #selector(showFontPicker), for: .touchUpInside)
        button.sizeToFit()
        button.backgroundColor = .clear
        
        view = button
    }
    
    func fontPickerViewControllerDidPickFont(_ viewController: UIFontPickerViewController) {
        dismiss(animated: true)
        isPickerPresented?.wrappedValue = false
        
        guard let fontDescriptor = viewController.selectedFontDescriptor else { return }
        onFontPick?(fontDescriptor)
    }
    
    func fontPickerViewControllerDidCancel(_ viewController: UIFontPickerViewController) {
        dismiss(animated: true)
        isPickerPresented?.wrappedValue = false
    }
    
    @objc func showFontPicker() {
        let configuration = UIFontPickerViewController.Configuration()
        configuration.includeFaces = true
        configuration.displayUsingSystemFont = false
        
        let fontPicker = UIFontPickerViewController(configuration: configuration)
        fontPicker.delegate = self
        
        present(fontPicker, animated: true)
        isPickerPresented?.wrappedValue = true
    }
}

struct FontPickerViewControllerRepresentable: UIViewControllerRepresentable {
    @Binding var isPickerPresented: Bool
    var onFontPick: (UIFontDescriptor) -> Void
    
    public func makeCoordinator() -> Coordinator {
        return Coordinator(self, onFontPick: self.onFontPick)
    }
    
    public class Coordinator {
        var parent: FontPickerViewControllerRepresentable
        let picker = FontPickerViewController()
        
        init(_ parent: FontPickerViewControllerRepresentable, onFontPick: @escaping (UIFontDescriptor) -> Void) {
            self.parent = parent
            picker.onFontPick = onFontPick
            picker.isPickerPresented = parent._isPickerPresented
        }
    }
    
    func makeUIViewController(context: Context) -> FontPickerViewController {
        context.coordinator.picker
    }
    
    func updateUIViewController(_ uiViewController: FontPickerViewController, context: Context) {
        if isPickerPresented {
            context.coordinator.picker.showFontPicker()
        } else {
            
        }
    }
    
    @available(iOS 16.0, *)
    func sizeThatFits(_ proposal: ProposedViewSize, uiViewController: FontPickerViewController, context: Context) -> CGSize? {
        uiViewController.view.intrinsicContentSize
    }
}

struct FontPicker: View {
    @State var isPickerPresented = false
    @State var selectedFont: UIFont?
    
    var font: Font? {
        if let selectedFont {
            return Font(selectedFont)
        }
        return nil
    }
    
    var body: some View {
        Button {
            isPickerPresented = true
        } label: {
            HStack {
                FontPickerViewControllerRepresentable(isPickerPresented: $isPickerPresented) { fontDescriptor in
                    let size = UIFont.preferredFont(forTextStyle: .body).pointSize
                    let font = UIFont(descriptor: fontDescriptor, size: size)
                    selectedFont = font
                }
                Spacer()
                Text(selectedFont?.familyName ?? "Not Selected")
                    .font(font)
                    .foregroundColor(.secondary)
            }
        }
        .onAppear {
            print(UIFont.preferredFont(forTextStyle: .body))
        }
    }
   
    }
}

struct Test3_Previews: PreviewProvider {
    static var previews: some View {
        Form {
            FontPicker()
            
            let defaultFont = UIFont.preferredFont(forTextStyle: .body)
            Text(defaultFont.familyName)
            Text(defaultFont.fontName)
        }
    }
}