Hey, thanks! Happy to help.
If you just want a looping audio file to play five seconds after the page loads, you probably don't need to interface with text-engine at all to do that. I would just add something like this in the script tag of your HTML (or a separate script file if you have more custom code you want to add):
const audio = new Audio('audio_file.mp3');
audio.loop = true;
setTimeout(() => {
audio.play();
}, 5000);
But if you want it to start 5 seconds after some particular event in the game, such as when the player enters a room, you could put the timeout in e.g. an `onEnter` function or etc. on your disk.
Hope this helps! If you need more help with this let me know.