Hi, Harry! Great question! Any experience is better than no experience, and like many on here have mentioned, a diverse set of experiences will always benefit you in the long run. Yes, focus on the requirements you have to achieve for attaining either one of those degrees (medicine/law), but if you're able to fulfill relative experiences, then going outside of these areas for now is perfectly fine. Think about the transferrable lessons/skills you can develop from those experiences and apply it to your respective field.
For example: In high school, I worked at a beauty salon. When applying to physician assistant school, I did not leave it off my application just because it was non-health related. It's still extremely relevant. I developed skills in communication, customer service, and team work. These are vital skills in medicine and the admissions committees value that.
Good luck! You'll do great!