New relic browser index.html

I have node express app
I have public folder /public also it add like app.use(express.static('./public')); and there index.html
so when I running

 node server.js

it shows me localhost:3000/index.html
How can I put in index.html

newrelic.getBrowserTimingHeader()

to see in localhost:3000/index.html NREUM object

New Relic for Node requires that an application be using an HTML templating library to inject the headers.

They have full documentation here: https://docs.newrelic.com/docs/agents/nodejs-agent/supported-features/page-load-timing-nodejs

The important bits to look at are the examples. These are from the docs on the example with using Express and Jade:

The simplest way to insert browser timing headings is to pass the newrelic module into your template, and then call newrelic.getBrowsertimingHeader() from within the template.

app.js

var newrelic = require('newrelic');
var app = require('express')();
// in express, this lets you call newrelic from within a template
app.locals.newrelic = newrelic;

app.get('/user/:id', function (req, res) {
  res.render('user');
});
app.listen(process.env.PORT);

layout.jade

doctype html
html
  head
    != newrelic.getBrowserTimingHeader()
    title= title
    link(rel='stylesheet', href='stylesheets/style.css')
  body
    block content

The chunk where the newrelic module gets set the application locals for use in the template is the important bit: app.locals.newrelic = newrelic;.

There's simply no way to run something in a static file the way Express's static module works by default. It pretty much streams the text content of the static file directly.