Hello Sandra, I think it can be done with custom work. Do you want them (the captions) to be overlaid or underneath?

Ok I think we can do it with custom work for a fee or provide guidance on how and where to implement it.

OK, first of all what do you use - Gutenberg or Elementor?

Ok, so if you are using Elementor you need to modify two files in nanotech-elementor-blocks plugin:

/widgets/scrolling-panels-widget.php and /widgets/moving-gallery-widget.php

taking scrolling panels as an example

you can edit the render function and add the captions there:

https://prnt.sc/0w1NBogfvLSZ