Create some build events in Visual Studio 2019 to loop in (preprep) the Angular gunk in your application?

At this put stuff in "Post-build event command line:" maybe? The commands you would run from a shell?

 
 

Addendum 2/5/2020: The following ends up in the .csproj file:

<Target Name="PostBuild" AfterTargets="PostBuildEvent">
   <Exec Command="cd ClientApp npm run build" />
</Target>