Unable to load projects in solution, when path contains a variable

[janaka44]

In my .net solution, there are some paths containing a variable name like this:
<ProjectReference Include="$(ConfigSrcDir)\AB.Config\AB.Config.Model\AB.Config.Model.csproj" />

CycloneDx complains with these errors as it cannot locate these projects:

Project file ".......\AB.Config.Model.csproj" does not exist

These variables are defined in a separate file: Directory.Build.targets

Is there a way to either:

1. Let CycloneDx know where these variables are defined ?
   OR
2. manually specify these variable values ?