Generate KeyStone.js 6 schema from modified Prisma schema

I had a project that was using the latest version of Prisma (3.9.1) and was planning to place a CMS on top of it. Keystone seemed like a very good fit as they already use Prisma internally. Unfortunately I couldn’t modify the Prisma schema because it was auto-generated from the Keystone schema. Is there a way to reverse the process and get a Keystone schema from Prisma ?