It's something we'd like to add (and you can follow along at
https://github.com/sourcegraph/cody), but in beta we're still focused on making it really lovable on the most popular config path rather than exploding the number of possible ways people could configure Cody. We do support "bring your own LLM account" for customers using Cody for all their devs, but that hasn't yet made its way to client-side config in the editor extension.