Firebase Genkit using prompt in chat

I am using chat with genKit library like below:

const session = agenticAi.createSession<any>({
  initialState: {
    uid: uid,
  },
});

const chat = session.chat({
  model: googleAI.model('gemini-2.5-flash'),
  tools: [getUserProfile, getFinanceData],
  maxTurns: 1,
  system: `To do the financial analysis use the tools you have to fetch users profile and current financial data using the passed uid ${uid}.`,
});

const response = await chat.send(msg)

I would like to avoid coding the system prompt outside in a .prompt file and created one. the code to call this prompt looks like below

const firePrompt = agenticAi.prompt('fire');
const promptResp = await firePrompt({ uid: uid, msg: msg });
console.log("fire prompt is:", promptResp.text)

but this does runs the prompt where i was expecting it to just bring it to be used in the chat.send.

my .prompt looks like below

---
model: googleai/gemini-2.5-flash
input:
  schema:
    uid: string
    msg: string
---
{{role "system"}}
To do the financial analysis use the tools you have to fetch users profile and current financial data using the passed uid {{uid}}. 
{{role "user"}}
{{msg}}

How can I change this implementation so that I can still keep the prompt outside?