Is it possible to add a button to only one item of a repeater?
I don’t think so, not without getting under the hood with Velo.
usually, repeater items got the same structure, so as per my experience it is not possible. But as for example, you can use 2 datasets n 2 repeaters with the same design, but this specific repeater with the only item is going to have an additional button setting. We will forward your query to the relevant team, @xdon
Piggybacking with Andrii and Danny, the repeater is meant to display the same items across all the items. If you want to have only one item with a button, a layouter may be more appropriate.