MSG is used in the food industry as a flavor enhancer with an umami taste that intensifies the meaty, savory flavor of - jkjkjk! I kid. It's literally just JavaScript.

High level:

__.page.js -> __.html

Low level:

//Inside ___.page.js
module.exports = function() {
  return html`
    <p>
      I'm honestly not kidding,<br />
      It's just JavaScript!
    </p>
  `
}