Migrating from T3 to T3 Turborepo

I have an existing T3 web app (Next, Clerk, tRPC) and I'm developing a mobile version. How can I utilize the existing tRPC endpoints and Clerk auth?
I know there's a monorepo sample that Theo went over in some videos, but I'm not starting from scratch.
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Migrating from T3 to T3 Turborepo - Theo's Typesafe Cult