If you want to know something from the therapist, this thing is no different. Ask. I think it is unlikely as I agree with others that mindfulness has become very popular in therapeutic approaches, because it works a lot. Worked for me, even in the context of having meditated for a couple of decades, as mindfulness is more about developing a kind of muscle to stay present/grounded in the moment of now. I think it's a helpful skill but like everything, doesn't work for everyone.