How to use "google-charts-node" npm package with dynamic parameters - node-modules

Question

I am trying to create charts using "google-charts-node" npm via REST api but getting this error everytime when I try to pass dynamic data from request body in the drawChart function but it works fine when I passed static parameters
Here is my code
const GoogleChartsNode = require('google-charts-node');
const express=require('express')
const body_parser=require('body-parser')
const fs = require('fs');
const app=express()
app.use(body_parser.json());
async function drawChart(body) {
var arr=[]
arr=body.chartData
console.log(arr)
var data = google.visualization.arrayToDataTable(arr);
var options = {
title: 'Revenue of C2C 2020',
chartArea: { width: '50%' },
hAxis: {
title: 'Revenue',
minValue: 0,
},
vAxis: {
title: 'Products',
},
};
var chart = new google.visualization.BarChart(container);
chart.draw(data, options);
}
const Img= async(body) => {
const image = await GoogleChartsNode.render(drawChart(body), {
width: 400,
height: 300,
});
return image
}
var bodyData
const getDataFirst=(data,callback)=>{
console.log('func',data)
callback(data)
}
app.post('/drawcharts', async (req,res)=>{
bodyData=req.body
getDataFirst(bodyData,async(data)=>{
console.log('callback',data)
const v= await Img(data)
console.log(v)
})
And getting this error
(node:9608) UnhandledPromiseRejectionWarning: ReferenceError: google is not defined
at drawChart (C:\Users\C2C04\Desktop\Charts\test.js:16:17)