How to add Llama 4 model in Google vertex to Librechat?

[sahas-bb]

Hi

We are using Llama 4 API service in Google Vertex as our LLM. We are looking to use Librechat as the chat interface. I couldn't find a straightforward way to integrate non-Google Vertex AI models with Librechat. Here's what I tried till now

• Tried adding custom endpoint, but Vertex AI doesn't just provide an API Key, it provides a whole file which should be used to generate key programatically. So, couldn't proceed
• Tried with Google Provider config as per documentation, got it for Gemini models but its not working for Llama models.

How to proceed now?