Client-side support

let str = "Hello <%= include('file', {person: 'John'}); %>",
      fn = ejs.compile(str, {client: true});
fn(data, null, function(path, d){ // include callback
  // path -> 'file'
  // d -> {person: 'John'}
  // Put your code here
  // Return the contents of file as a string
}); // returns rendered string

<div id="output"></div>
<script src="ejs.min.js"></script>
<script>
 let people = ['geddy', 'neil', 'alex'],
 html = ejs.render('<%= people.join(", "); %>', {people: people});
 // With jQuery:
 $('#output').html(html);
 // Vanilla JS:
 document.getElementById('output').innerHTML = html;
</script>