System instructions

[glaksmono]

https://cloud.google.com/vertex-ai/generative-ai/docs/learn/prompts/system-instructions#gemini-system-instructions-code-samples-python

Do you support this?

Gemini AI HTTP Error (spotted in ruby-gemini-ai 0.1.1): {"error"=>{"code"=>400, "message"=>"Please use a valid role: user, model.", "status"=>"INVALID_ARGUMENT"}}