What I consider my biggest success career wise, doesn't relate directly with my career nowadays, it happened years ago when I was a teacher. Is it okay if I tell that story even if it lays more on the personality trait than the common company (numbers) achievement?

Let me explain: I teached art to children in difficult family/socio-economic environment. I was able to provide a safe space for them once a week, I got to hear really touching life stories and some how was able to help a little to make their lives somewhat easier at least for those couple of hours every week. I normally focus this on being a good team player, coworker and possibly a mentor.

I am now a designer applying for jobs, is this story valid or is better if I focus on numbers, company gains, revenue?