Question: Nested repository embeddings?

I’m working on a project to create plugins, themes, and skins for NodeBB. They expect my creations to live in the node_modules folder. I’m planning to use docker to run the container and want cody to help me code them. What’s the best way to set this up? I can fork their entire repo and make my changes that way I guess but is that the best way? Does cody support a nested repository (submodule)? Will it create embeddings for the nested repo? Or can I somehow tell it to use embeddings from the main repo while I have my custom code in a separate repo?