How to enable reasoning in gemini-2.0-flash-thinking-exp-01-21 with ChatGoogleGenerativeAI?

[DecX-x]

I'm using ChatGoogleGenerativeAI in LangchainJS with gemini-2.0-flash-thinking-exp-01-21, but I noticed that there is no thinking or reasoning output.

Is there any way to enable a "thinking mode" for this model in ChatGoogleGenerativeAI? Are there specific configuration? Any insights would be really helpful!

const model = new ChatGoogleGenerativeAI({
  model: "gemini-2.0-flash-thinking-exp-01-21",
  apiKey: gemini_api,
  temperature: 0.7,
  streaming: true, 
  
});