text: Title: Add support for `Prisma.JsonNull` equivalent
  Body: ## Problem
  
  <!-- A clear and concise description of what the problem is. Ex. I'm always frustrated when [...] -->
  
  https://discord.com/channels/933860922039099444/1080804462970535996/1080804462970535996
  
  ## Suggested solution
  
  <!-- A clear and concise description of what you want to happen. -->
  
  Implement equivalent of https://www.prisma.io/docs/concepts/components/prisma-client/working-with-fields/working-with-json-fields#using-null-values