<script src="//code.jquery.com/jquery-3.2.1.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(function () {
    //set section text and field name
    AddSectionBeforeField("Informatat baze","Last Name");
    AddSectionBeforeField("Employment Data","Company");
});
function AddSectionBeforeField(sectionText,fieldName){
    var $fieldTR=$(".ms-standardheader nobr:contains('"+fieldName+"')").closest("tr");
    $fieldTR.before("<tr style='background-color:gainsboro'><td colspan='2' class='ms-formbody' style='padding:0'><div style='font-size:16px;font-weight:bold;'>"+sectionText+"</div></td></tr>");
}
</script>