Passing environment variables to dotnet-cyclonedx

In some of my .csproj files I use variables to support different deployments.

example:

dotnet-cylonedx cannot resolve $(SourceDir) and will log an error that the project file does not exist.

How can I provide this $(SourceDir) as environment variable to dotnet-cyclonedx?

Start by reproducing the reported failure with dotnet-cyclonedx and a .csproj containing ProjectReference Include="$(SourceDir)SomePath\SomeProject.csproj". Trace how the tool loads the project and handles the SourceDir value; done means establishing a supported way to provide the variable or documenting that limitation.

Written by the indexing model from the issue text.