I have a web project (mvc5) with a project.json inside.
Also, I have a nuget package. Inside this package (besides the dll reference) I have some Conten
you could add a msbuild target to your package. in this target you can execute the nuget restore command...
example:
see: https://docs.microsoft.com/en-us/nuget/create-packages/creating-a-package#including-msbuild-props-and-targets-in-a-package