storing javascript in text area

I remember that for security you’ve disabled storing javascript in a textarea, but you gave me a workaround that I can no longer find. I want to have the user store some html in a custom field in a Post, then use Beaver Themer to connect to that code and insert it into an html module on the Post Singular BB template.

Here’s a sample of the code (only the data-id value changes on every Post)

`<div class=”into-container gn-immune cleanslate”>
https://embed.lookin.to/badge/badge.bundle.js
</div>

How can I do that?