How to set TitleBarColor in a Service on Windows

[AndreasReitberger]

I'm trying to update the TitleBarColor, when the AppTheme changes. For iOS and Android I got following working service.
But it doesn't work for Windows due to the fact that the service is nut a AppWindow, so it doesn't find the window.

Is there a way to get the AppWindow?
I found this, but MauiWinUIWindow.Current is also null when accessing it from the service....

iOS:

// Source: https://stackoverflow.com/a/39164921/10083577
public partial void SetStatusBarColor(Color color)
{
    if (OperatingSystem.IsIOSVersionAtLeast(13))
    {
        //var currentWindow = WindowStateManager.Default.GetCurrentUIWindow();
        // Nothing to do here, if needed use the `StatusBarBehavior`
        // Docs: https://learn.microsoft.com/en-us/dotnet/communitytoolkit/maui/behaviors/statusbar-behavior?tabs=ios
        // Git : https://github.com/CommunityToolkit/Maui/blob/main/src/CommunityToolkit.Maui/Behaviors/PlatformBehaviors/StatusBar/StatusBarBehavior.shared.cs
    }
    else
    {
        if (UIApplication.SharedApplication.ValueForKey(new NSString("statusBar")) is UIView statusBar && statusBar.RespondsToSelector(
        new ObjCRuntime.Selector("setBackgroundColor:")))
        {
            // change to your desired color 
            statusBar.BackgroundColor = color.ToPlatform();
        }
    }
}

Android:

// Source: https://stackoverflow.com/a/39164921/10083577
public partial void SetStatusBarColor(Color color)
{
    // The SetStatusBarcolor is new since API 21
    if (Build.VERSION.SdkInt >= BuildVersionCodes.Lollipop)
    {
        var androidColor = color.AddLuminosity(-0.1f).ToAndroid();
        Microsoft.Maui.ApplicationModel.Platform.CurrentActivity?.Window.SetStatusBarColor(androidColor);
    }
    else
    {
        // Here you will just have to set your 
        // color in styles.xml file as shown below.
    }
}

Windows:

AppWindow m_AppWindow;
public partial void SetStatusBarColor(Color color)
{
    m_AppWindow = GetAppWindowForCurrentWindow();
    // https://learn.microsoft.com/en-us/windows/apps/develop/title-bar?tabs=wasdk
    if (AppWindowTitleBar.IsCustomizationSupported())
    {
        AppWindowTitleBar m_TitleBar = m_AppWindow.TitleBar;
        // Not supported on WinUI3
        /* */
        if (m_AppWindow == null)
        {
            m_AppWindow = GetAppWindowForCurrentWindow();
        }
        AppWindowTitleBar titleBar = m_AppWindow.TitleBar;
        titleBar.BackgroundColor = color.ToWindowsColor();
        
    }
}

#region Private
AppWindow GetAppWindowForCurrentWindow()
{
    IntPtr hWnd = WindowNative.GetWindowHandle(this);
    WindowId wndId = Win32Interop.GetWindowIdFromWindow(hWnd);
    return AppWindow.GetFromWindowId(wndId);
}
#endregion

Any help is appreciated!