BUI add-in pop-up editing

Summary

On creation of a pop-up some backend logic is done and then want to update the pop-up view.

Content

Hi there,

In the "IPopupWindow" and "IPopupWindowContext" objects I am using setContentUrl to link to an html page.

I would like to edit the html using some backend logic before rendering to the screen.

Is there a way to edit the popup content after using setContentUrl or should I amend the html before setting setContentUrl?