Answer by Liyun Zhang - MSFT for Is Google Maps Sdk programmatically added markers using net8 MAUI free of charge?

First of all, you can check the offcial document about the Android Google Map Marker. And you can add the marker by calling the platform native code.

Give a name to the Map control in the xaml:

<Map x:Name="map" ..../>

And declare the android platform method:

#if ANDROID        public void AddMrker(double x, double y,string title,string snippet)        {            var googlemap = map.Handler.PlatformView as Android.Gms.Maps.GoogleMap;            var markeroption = new Android.Gms.Maps.Model.MarkerOptions();            markeroption.SetIcon(Android.Gms.Maps.Model.BitmapDescriptorFactory.FromResource(Resource.Drawable.dotnet_bot));            markeroption.SetPosition(x, y);            markeroption.SetTitle(title);            markeroption.SetSnippet(snippet);            googlemap.AddMarker(markeroption);        }#endif

You can copy your custom image file into the \Resources\Images\pin.png and set its buid action as MauiImage. And use it:

markeroption.SetIcon(Android.Gms.Maps.Model.BitmapDescriptorFactory                              .FromResource(Resource.Drawable.pin));

In addition, you can check the official document about the Maui Map Pins and this case about custom map pin.