Multi-image in a CMS List + Finsweet sugar

Can someone explain how this Finsweet example works?

Where do the pictures in each mini carousel come from?
Each seem to be linked to a unique slider via “slider-2” “slider-3” custom attribute fields etc but how are they populated? And can those images be pulled from a multi-image field of a CMS list item?

Would love a low/no-code solution for an image carousel inside a CMS powered list.
thanks!