You can get the entire repeater, including nested repeaters
get_field('repeater_name');
or you can get an entire nested repeater
get_sub_field('nested_repeater_name');
this will return the entire contents of the repeater as an array and then you can jump back and forth in the array as you need to.
But finding a specific value in the repeater will require looping through the array or nested array to find the row you’re looking for in any case.
