I did not quite understand what you were trying to do.
Anyway, the simplest way to send information to Lightbox is to use the API .
If you plan to create 20 similar pages, I would recommend that you keep all the information in the database and create dynamic pages .
This way allow you create only one page that will use as a template.
You can get the right iFrame’s link from the item’s dataset and set the link to the iFrame on onReady.