C# Adding generationconfig in the GeminiChatAgent

[whatohyou]

1. I want to use c# Autogen.Gemini nugetpackage to make a chinese-english translator.
2. I want to set system Message = "You are a good translator... etc.";
3. I want to set temperature = 0; (temperature is important for correct translation.)

What I have tried,(By looking at the sample codes)

var geminiAgent = new GeminiChatAgent(  
name: "gemini-unique-name",
                        model: "gemini-2.0-flash",                        
                        apiKey: apiKey,                        
systemMessage: "You are a good translator... etc."
   )
                   .RegisterMessageConnector()
                   .RegisterPrintMessage();

var reply = await geminiAgent.SendAsync("第1章");

Problems are...

1. I don't know how to set up generativeconfig-temperature settings. I can't include it to the GeminiChatAgent to make it translate correctly.
2. It seems geminiAgent is writing reply to the console. Is there a way to stop it and just get reply in string variable?
   (I'm maybe wrong.)

Thank you.