'Want to get Users group in lambda function

I'm creating a custom template to verify email. For this i have created a lambda function in node.js. I need user groups to get role but unable to find in events. Below is my code. I have tried to find a solution but could not get it.

'use strict';

exports.handler = async (event, context, callback) => {

const email = event.request.userAttributes.email;

console.log(context);

console.log(event.request.userAttributes.email);

console.log(event);

const name = event.request.userAttributes.name;

const template = (name) => `<html> </html>`;
  
  
  if (event.triggerSource === "CustomMessage_SignUp") {

    event.response = {
        emailSubject: "Activate: Confirm LAGO Account Email",
        emailMessage: template(name, link)
    };
  }
  console.log(event.response);
  callback(null, event);
};


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