Merge tag filter to add to list output

<?php
// http://www.gravityhelp.com/forums/topic/text-here#post-101367
add_filter('gform_merge_tag_filter', 'add_ingredient_markup', 10, 4);
function add_ingredient_markup($value, $merge_tag, $options, $field){
    // field 5 is the list we want to modify
    if($merge_tag == '5'){
        $find = '#<li>#';
        $replace = '<li itemprop="ingredients">';
        $ingredient_list = preg_replace($find, $replace, $value);
        return $ingredient_list;
    }
    else
        return $value;
}