Building a tool to help founders rewrite AI copy in their own voice.

The hardest design question I'm sitting with right now: how do you actually capture how someone talks?

My current thinking is to ask founders a few specific questions about their product, then use those answers as the voice reference. But I'm not sure that's the right input.

Has anyone tried to document or systematize their own writing voice? What actually worked? What felt forced?

Would save me weeks of going in the wrong direction.