Question about Accessibility in Adobe Captivate – Adding Icons with Alt Text

Hi, I have a question regarding accessibility in Adobe Captivate. In the e-learning courses we develop, all content must be readable using a braille display.

Currently, when linking to an external URL that opens in a new tab, we indicate this by writing something like: www.thisisexample.com (opens in new tab).

However, I would like to replace the text "(opens in new tab)" with an icon, such as a "square with an arrow out of the right corner", to visually indicate to sighted users that the link opens in a new window. At the same time, I need users relying on a braille display to receive the same information, for example:
www.thisisexample.com - icon: webpage opens in new tab/window.

Is there a way to insert icons into text fields in Adobe Captivate while ensuring that they include appropriate alt text or accessible descriptions for braille display users?

Thanks in advance!