UIBuilder Using URL variables

[UnborN]

@Ashfaak

Is it possible to use variables of this form when using UIBuilder?

Most probably. uibuilder just serves your html and js files and hadles the back and forth of messages between NR and your front end code ... its up to you to handle with your code any url parameters.
Read this article that describes how to get the URL parameters.

const queryString = window.location.search;
const urlParams = new URLSearchParams(queryString);
const site = urlParams.get('site')  // 'abc'