you need work a little different here. The basic repeatinggroup functionality can help you here. However, the settings must be different to “Fixed number of cells”. In your case it’s one.
Then you can select the current page number (the current number you are looking at), this would be your first number before the scroll I guess. If not it would be current number - minus one.
The total number can also be taken from the repeating group.
I made a very simple example for you to understand. I do have a list of things (6 things) I will only show at a time. I do have two buttons. One shows me the next thing, one shows me the previous thing.
Settings repeating group
Text showing your current number:
Text showing you total number:
Button for Next and previous
I think this helps you going forward.