How to use v0-max model with the v0 API for chat creation

Hello, I understand that we can force a model (e.g. v0-max) to be used explicitly in the v0.app website via the dropdown right now. However, I would like to use the API to use a specific model. Is that possible?

v0.app

Create Chat | v0 Docs

Creates a new chat using a user message, optional system context, and model configuration. Useful for prompting the model within the scope of a specific project.

Note: The modelId field is deprecated so it doesn’t work.

Does a Vercel or v0 staff know the answer to this one? Is it not possible via API for now?