Nick here from Shopify.
Would you be able to share your store URL and I can see if this is possible for you please? If you could also highlight where you'd like the carousel box to be it would be hugely helpful.
To confirm, you're looking to add another custom image carousel box that will go at the bottom of your store homepage? Would you like it to just be on the homepage or every page of the store also?
Looking forward to hearing from you and finding out more information and we can then see if this is possible and if it is, the best next steps to get it.
All the best, Nick