TextTemplating target in a .Net Core project

Question

I have recently migrated a test project to .NET Core 2.0. That test project used text templates to generate some repetitive code. The previous project had a build target to generate all T4-templates before build. Therefore, the generated code is also not checked in into the VCS.

I had used this snippet in the project to ensure that templates are built:

<PropertyGroup>
  <!-- Default VisualStudioVersion to 15 (VS2017) -->
  <VisualStudioVersion Condition="'$(VisualStudioVersion)' == ''">15.0</VisualStudioVersion>
  <!-- Determinate VSToolsPath -->
  <VSToolsPath Condition="'$(VSToolsPath)' == ''">$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)</VSToolsPath>
  <!-- Run T4 generation if there are outdated files -->
  <TransformOnBuild>True</TransformOnBuild>
  <TransformOutOfDateOnly>True</TransformOutOfDateOnly>
</PropertyGroup>
<!-- Import TextTemplating target -->
<Import Project="$(VSToolsPath)\TextTemplating\Microsoft.TextTemplating.targets" />

My first approach was to keep this fragment and copy it to the new .NET Core project file.

Inside Visual Studio, this works because apparently, VSToolsPath is set correctly. However, when I run the .NET Core SDK tools, as for example dotnet test (as I do on the build server), VSToolsPath maps to Program Files\dotnet\sdk\2.0.3 and there, the text templating targets cannot be found.

Because that did not work, I also tried to simply install the Microsoft.VisualStudio.TextTemplating package from Nuget but that has two problems:

1. it does not officially support .NET Core and installs for .NET 4.6.1 and
2. Nuget does not seem to install anything, so I cannot adjust the paths in the project file.