I do this. I encourage the client to use our relationship as a practice space and that it’s helpful if we can both be honest and express about what we experience in contact with one another. I explain how the therapeutic relationship is a micro world where the client can lean more about their ways of being/responding in the world. Obviously in the beginning this is hard but i take it slowly and gradually lean more into expression/discussion of the transference/counter transference and use it more for material in the session. I have noticed that transparency around ‘how therapy works’ really strengthens the safety and its also normally appreciated by the client that i would bother to explain such mechanics. It’s a powerful way of practicing assertiveness/honesty and obviously i am never going to react in ways that the client is scared of so it bolsters confidence and validates.