Is there a way to have text in a pop-up box rather than a link to a new page?

Site URL: https://www.intothedarksf.com/

I need to add a page for the cast for the new Fall show.  I would like the page to have a gallery of the cast photos and have their bio appear in a pop-up box rather than link to a new page.  Is this possible?

You mean click on each cast photo in gallery block >> Show a popup with bio?