How to add mismatch to Monte Carlo design variables?

Hi,

I would like to run a monte carlo simulation with design variables in ADE-XL. I read one useful previous question in the forum:

https://community.cadence.com/cadence_technology_forums/f/custom-ic-design/38316/monte-carlo-design-variables.

But I found it can only work for process variation. My question is how to add mismatch variation in the spectre model to allow mismatch Monte Carlo simulation on design variable or any other way to do that.

Thank you,

Yang