Gen AI module - roles and api

**Is your feature request related to a problem? Please describe.**
I am trying to deploy the RADLAB Gen AI module. I have to add additional roles in order to follow the demo : https://github.com/GoogleCloudPlatform/generative-ai/tree/main/gen-app-builder/search-web-app. I also need to enable additional api's

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Can we have additional roles to the notebook roles? or maybe add a variable that can concat and add these roles.

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