👋 Hi @Rob, thank you for the question! Prisma Client Extensions is indeed something the team is still working on it and we do also have an item for Virtual fields (see issue #3394).
If these issues meet with your exact use case I encourage you to 👍 upvote them and add a comment with your requirements - GH Issue comments is the best signal that engineers use to prioritize work.
In the meantime, I also wanted to share this guide in case it is helpeful: https://www.prisma.io/docs/concepts/components/prisma-client/computed-fields
👋 Hey @Rob did you have a chance to see my comment? Let me know if this is still an open question! 🙂