How to use T4 with WinUI app namespaces?

[ghost1372]

i want to use T4 with my WinUI 3 app, i need to use Microsoft.UI.Xaml.Controls namespace and classes. but using following codes is not working and get a not found error

<#@ assembly name="Microsoft.UI.Xaml.Controls" #>
<#@ import namespace="Microsoft.UI.Xaml.Controls" #>