This one require's a deeper understanding of JS/ jQuery, and after inspecting a little bit i'm quite sure it's possible,
I apologise that i cant take you through the whole thing however but am happy to set you off in the right direction, if things prove too difficult you may wish to seek the aid of a developer to achieve this task:
The Carousel cannot be set to "loop" otherwise this will not work -
When the Carousel wrapper reaches it's last slide a class "hide-next-related-ui" gets added that prevents us from going further:
but this is good news! as we can take this action and build upon it.
Using jQuery we can wait for the element to exist:
( google searches are so long... )
And then once it exists we can add a class:
And this could do anything you wish, make an image appear - make a link appear, change the color of something etc etc
Additionally if the Class "hide-next-related-ui" were to not exist anymore because you moved the carousel back to previous slides then its important that our new content would then also disappear as well.
https://www.w3schools.com/jquery/html_removeclass.asp#:~:text=The removeClass() method removes,names from the selected elements.
It's a bit of a tricky one but is possible!
Apologies once again that i am unable to help you with deeper customisation,
Best wishes & good luck