Modeling parameter uncertainty in Simscape model

Hello,

I was wondering if there is a way to model parameter uncertainty with Simscape models. In my case I have a Simscape model of an inverted pendulum, where I want to vary mass and length of the pendulum and analyse the impact on the result. I have found the examples for robust analysis of Matlab/Simulink models using the robust control toolbox but I haven´t figured out how to apply this to Simscape models, where parameters like mass or length are basically "hidden" in Solid Blocks?

Best regards

Jooo