https://learn.microsoft.com/en-us/windows/windows-app-sdk/api/winrt/microsoft.ui.xaml.documents.textelement.characterspacingproperty?view=windows-app-sdk-1.8
TextElement.CharacterSpacingProperty Property (Microsoft.UI.Xaml.Documents) - Windows App SDK |...
Identifies the CharacterSpacing dependency property.
windows apppropertymicrosoftuixaml