Reference a local WSDL in a .NET Core SOAP service

Question

I have a SOAP service defined by a local .wsdl file that I want to use to generate a .NET Core Connected Service in Visual Studio 2017.

My ConnectedService.json looks something like this:

{
  "ProviderId": "Microsoft.VisualStudio.ConnectedService.Wcf",
  "Version": "15.0.20119.1312",
  "ExtendedData": {
    "Uri": "C:\\Path\\MyUsername\\LocalRepository\\soap-service.wsdl",
    ...
  },
  ...
}

The problem is that this completely breaks for anyone else who accesses this source and doesn't put their local repository in the exact same location as I do.

I want the reference to be relative to the project, like "Uri": "soap-service.wsdl", but that results in an error:

How can I configure ConnectedService.json so that it finds the local file relative to the .NET project?