As Sam says, detail would help- but as you’ve seen, Webflow doesn’t allow you to drop rich text directly into HTML Embeds.
Normally, that’s not something you’d want to do, because it’s potentially a big chunk of HTML, but you might have a scenario where it make sense, in which case you can;
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Emit that HTML somewhere on the page, within a Collection Page or Collection List. Then use your script to access it and do something with it. You can hide that element if you want.
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Emit that HTML on to your Collection Pages ( hidden, optionally ), and then access it from other pages using
jQuery.load()