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You can evaluate the Gemini series of LLMs, available through APIs in Google Vertex AI, using Vijil Evaluate.

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Store Credentials

First, you need to store credentials from your Google Cloud account as API key configuration in Evaluate. To do so, follow the instructions here to log into your account from a command-line environment, and get the contents of the application_default_credentials.json file. 
gcloud auth application-default login
vi $HOME/.config/gcloud/application_default_credentials.json
# {
#   "account": "",
#   "client_id": "XXX.apps.googleusercontent.com",
#   "client_secret": "d-FLXXX",
#   "quota_project_id": "xxx-xxx",
#   "refresh_token": "xxx-123",
#   "type": "authorized_user",
#   "universe_domain": "googleapis.com"
# }
Copy the fields client_id, client_secret, quota_project_id, and refresh_token. The gcloud CLI asks you to select a region when logging in, keep that handy as well. Now log into Vijil Evaluate, and navigate to Keys > Add new key. From the Model Hub dropdown, select Vertex as your chosen hub, and add the above information in the respective fields. Vertex Hub Config Give the API key configuration a name, save it, and you are ready to go! To add the credentials using the python client, you need to supply the fields inside the hub_config argument. 
client.api_keys.create(
    name="vertex-test",
    model_hub="vertex",
    hub_config={
        "region": "us-central1",
        "project_id": "xxx-xxx",
        "client_id": "XXX.apps.googleusercontent.com",
        "client_secret": "d-FLXXX",
        "refresh_token": "xxx-123",
    }
    rate_limit_per_interval=120, # optional
    rate_limit_interval=60 # optional
)

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Run an Evaluation

To run an evaluation from the UI, simply select Vertex as the Model Hub, and pick one of the listed models. To run an evaluation using the python client, use the following code pattern, with a harness of your choice. 
client.evaluations.create(
    model_hub="vertex",
    model_name="google/gemini-1.5-flash-001",
    model_params={"temperature": 0},
    harnesses=["hallucination"]
)