how to parse a string to maintain the formatting in js code example

Example 1: javascript string format

//

const firstName = 'john';
const lastName = 'smith';

const output = `name: ${firstName}, surname: ${lastName}`;
// name: john, surname: smith

Example 2: nodejs format text

var my_name = 'John';
var s = `hello ${my_name}, how are you doing`;
console.log(s); // prints hello John, how are you doing