I tried to add some label on Sharepoint 2013 forms with jquery prepend. I write a code for testing purpose, add a row with text 'Label1' before column name 'Project'. It doesn't work, 'Label1' is not showing up. See code below.
<script type="text/javascript" src="mysite/SiteAssets/jquery-1.11.3.min.js"></script>
<script type="text/javascript">
$(doucument).ready(function(){
$('nobr:contains("Project")').closest('tr').prepend("<tr><td colspan='2'>label1</td></tr>");
});
</script>