Hmmm, looking at the source, it seems it ain’t supported. No reference to

--path

at all to be found: https://github.com/pulumi/pulumi/blob/3be1ea9592b305df8aeb83c3810aee9bb8adeb7a/sdk/go/x/auto/local_workspace.go#L166-L184

Thanks for filing. I suggested a workaround on the issue.