Is it possible to evaluate a variant control expression that contains a value inside a structure array?

To specify conditions for variant choices of a variant subsystem, I normally use a Simulink.Variant object such as

Simulink.Variant('Dev1SubsystemC_Option==2')

and then define Dev1SubsystemC_Option=1 or =2 or =3 in the workspace.

But because my current model is big and complicated, I need to put all parameters including variant settings within an organized structure. So instead of evaluating Dev1SubsystemC_Option in the base workspace, I tried to use

Simulink.Variant('Device(1).Subsystem_C.Option==2')
Error due to multiple causes.

Caused by:
    'Device(1)' is not allowed as the left-hand side of 'Device(1).Subsystem_C' in variant  condition expression
    'Device(1).Subsystem_C.Option==2'. Only enumerated type names are allowed.
    'Device(1).Subsystem_C' is not allowed as the left-hand side of 'Device(1).Subsystem_C.Option' in variant  condition
    expression 'Device(1).Subsystem_C.Option==2'. Only enumerated type names are allowed.

which gives me errors. I'm not sure why MATLAB doesn't want to accept this Boolean expression. Is there a way to work around this? I'm using MATLAB 2015a.

Thanks

[JWiesemann]

Still no answer after more tha a year? Maybe "MATLAB Answers" is a misleading name.

[Josh Chambers]

This is a pretty weird and serious limitation that I just ran into. Also, what the heck does it mean "Only enumerated type names are allowed"?? Also, please respond mathworks!

2016a here