I don't know. I'm an older person now. But many years ago, I was bullied incessantly verbally, emotionally and physically for 4 years by a gang of older boys one of whom beat me up breaking my nose in the process. (In the end I got blamed for it.)
When I consider what you propose, what occurs to me is that something such as this has the potential to simply open a can of worms, so to speak, without really accomplishing anything. Is this really going to make you feel better about what this person did to you? Is there a possibility that, after you do it, you'll feel a sense of satisfaction for a short while, but then you'll start itching to do just a little bit more... and then a little bit more? In other words, is this just a first step down a slippery slope?
Believe me I know how you feel about having been bullied. And the fact this person is now a counselor does make it all seem just that much more hurtful I would imagine. (I have no idea whatever happened to any of my bullies. To be quite honest, I hope they all died... young!) But I don't know if what you're thinking of doing really serves any useful purpose. I see you're going to be talking with your therapist about it. And I think that's a good plan. My own opinion, for what it's worth, would be to forget trying to do something to get back at your bully & focus on healing that part of you the bullying damaged so you can (hopefully) let go of what happened to you & move forward with your life. I do understand what you wrote about the pandemic situation bringing up painful memories. This is something I'm struggling with as well. My best wishes to you...