How do I get access to preview models for my GCP account?

I have a GCP account (with billing enabled) which I use for accessing Vertex AI APIs. I need access to the preview models (gemini-3-flash-preview, gemini-3-pro-preview, nano banana pro) but I can’t find an option to request API access directly from inside GCP.

Any help is appreciated.

I created this as well but no response so far, am i missing something?