you could enter something like
title:Jaws,year:1975,genre:Thriller
as a value and then do something like
$movie_array = array();
$movie = get_sub_field('movie');
$list = explode(',', $movie);
foreach ($list as $value) {
$parts = explode(':', $value);
$movie_array[$parts[0]] = $parts[1];
}