Altering the font size (and other font formatting attributes) of the Shell class’ back button’s overridden text

I have a ContentPage (that is a content of the sub-classed Shell class) which, when viewed requires a back button with a specific string text to be present in the navigation bar.

        <BackButtonBehavior IsEnabled="True" 
                            TextOverride="A" />


The back button with the required text is displayed as expected in the navigation bar, but the text is not quite in the required font size.

As always with such problems, I attempted to resolve the issue by using a custom shell renderer (as seen below), but I am not able to fathom the way to alter the font size of the text of the back button.

class ShellRenderer
            : ShellRenderer
    public ShellRenderer
            (Context context) : base(context) { }

    protected override IShellToolbarAppearanceTracker 
        return new CustomToolbar(this);
    public class CustomToolbar 
                  : ShellToolbarAppearanceTracker
        public CustomToolbar
               (IShellContext context) : base(context) 

        public override void SetAppearance
          (AndroidX.AppCompat.Widget.Toolbar toolbar,
           IShellToolbarTracker toolbarTracker, 
           ShellAppearance appearance)
                (toolbar, toolbarTracker, appearance);

            // How do you increase the font size of the back button??

Thanks in advance.

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