How to "run" a function on JavaScript via Reference?

I am new to studying JavaScript, and I have a function written in JavaScript that starts a simple countdown display, but I had a question how I can “run” this function by building a “one-way” connection from my project to extension using Reference (Link)? Please tell me what “EndPoint” should I use in this case?
And do I understand correctly - in order for all this to work, I need to write a file BackEnd.js, which will describe what will happen during the request from my project to the extension?

Basically you want to trigger a countdown on your extension from your backend or the configuration view?

If you want to send real time messages you can use the extension pubsub

And use the listen methods from the javascript helper to get the message sent by your server and call your javascript function on your frontend

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