Have you tried some of the local ai plugins for neovim? You can specify the model and then maybe use it to help with editing? I'm sure it's not as smooth as whatever magical Mac thing OP is referencing.
I do use ollama and a handful of models, but AI writing is increasingly detected and penalized by Google, et al, when writing for the web. So, the goal is less of it, not more. Nothing magical about what iA built. They just put in the work to create an excellent rules engine.