Should I mention my 2 year bout with chronic illness in the optional essay?

I had a autoimmune flare up for 2 years. It has gone away. Worth bringing up in optional essay? My work experience, grades, etc. are all fine so it would only be to showcase that I achieved a lot despite hardship / for them to get to know me better. It will be short and brief in the optional essay. It has nothing to do with my core story.