How to Manually Add a .nupkg Nuget Package to VS Code?

I'm attempting to create and run a new ASP.NET 5.0 project that requires a specific .nupkg be installed. I'm creating / running it from the VS Code CLI.

Our IT department has provided the .nupkg, but not installed it, and I have not been able to find a way to allow VS Code to reference it. I have seen some tutorials showing how the full Visual Studio can add a local .nupgk, but not VS Code.

I have the extension Nuget Package Manager, but our security settings don't allow it to download anything directly, hence the provided .nupkg.

Is there any way to add a .nupkg in a way VS Code can reference it when making a new ASP.NET 5.0 project?

Thanks!