yea, there are sections in the application where you can write more about your experiences.
on the other hand, if you wanted to write about it in your PS, I'd make sure it's related to why you want to be a doctor. don't list your accomplishments and achievements in the PS. wisely spend the space you have talking about your passion for becoming a doctor and why you want to. so, if the experiences you have had in Switzerland somehow made you realize you wanted to be a doctor or further confirmed your desires to become a doctor, then i'd write it. otherwise, it might not really be beneficial to you as an applicant. you want to make yourself stand out, but at the same time, it should be in the scope of becoming a doctor. good luck and ask questions!