[Feature Request] Can we get support for MedLM with Vertex plugin?

[santhonydo]

Is your feature request related to a problem? Please describe.
I have access to MedLM model but can't use it with GenKit Vertex plugin since it's not supported.

Describe the solution you'd like
Add support for MedLM in Vertex plugin

Describe alternatives you've considered
simple fetch

Additional context
I am building for healthcare professionals so MedLM is essential for the task.

[i14h]

@santhonydo have you implemented anything yourself? this is a very limited usecase LLM and I'm not sure we should put it in Genkit core