How to track clicks on elements that are loaded from an external script?

Question

Google Analytics

The html page has a block with a script that pulls content from another server:

<script src="https://domain.com/script.js"></script>
<div class="content-widget" data-theme-id="1" data-btn-text="2"></div>

Actually, the content is displayed in the div. How do I set up click counting for clickable content items? There is no access to an external script.