Mapping between a XAML namespace and a CLR namespace in WinUI 3

[ghost1372]

Discussed in microsoft/WindowsAppSDK#2946

^{Originally posted by vladimir-stoyanov September 8, 2022}
Is it possible to map between a XAML namespace and a CLR namespace in WinUI 3?

For example in WPF, the following attribute: XmlnsDefinition is placed in the AssemblyInfo.cs file in order to achieve this.

Is this achievable in WinUI 3 and if so how?

is there any plan? this is very useful for Class Library projects @Scottj1s @duncanmacmichael @michael-hawker @codendone