// new line
$row .= '<div id="' . $field_name . '_' . $next_value . '_wrapper">';

// editted line
$row .= '<div id="' . $field_name . '_' . $next_value . '_trigger" data-dynamic-show="' . $field_name . '_' . $next_value . '_content" class="by-admin-dynamic-title">' . $value->{'title'} . ' <span class="up">&#9652;</span><span class="down">&#9662;</span></div>';

// new line
$row .= '</div>';


// jQuery
<script>
    jQuery("#by_product_fast_facts_container div div span").css({'cursor': 'pointer', 'float':'right', 'font-size': '20px', 'width':'20px'});

    jQuery("#by_product_fast_facts_container div div .up").on('click', function(e) {
        e.stopPropagation();
        jQuery(this).parent().parent().insertBefore(jQuery(this).parent().parent().prev());
    });

    jQuery("#by_product_fast_facts_container div div .down").on('click', function(e) {
        e.stopPropagation();
        jQuery(this).parent().parent().insertAfter(jQuery(this).parent().parent().next());
    });
</script>