How to add dynamic data in table format on the notification in ServiceNow

Notification Body:

Hi Team,
    Please note that Incident list of unassigned Tickets.
    ${mail_script:incident.reminder.email}
    Please identify an appropriate owner and take necessary steps to resolve the Incident.

Email Script:

(function runMailScript( /* GlideRecord */ current, /* TemplatePrinter */ template,
    /* Optional EmailOutbound */
    email, /* Optional GlideRecord */ email_action,
    /* Optional GlideRecord */
    event) {
    var html = '';
    html += "<table border='1px solid #ce2127' style='font-size: 10pt;'><tr><th style='text-align:center;width: 85px;'><b>Number</b></th><th style='text-align:centerwidth: 100px;'><b>Assignment Group</b></th><th style='width: 100px;'><b>Created By</b></th><th style='width: 100px;'><b>Opened at</b></th><th><b>Short Description</b></th></tr>";
    var app = new GlideRecord('incident'); //create a query to retrieve open approvals
    app.addEncodedQuery("numberIN" + event.parm1);
    app.query();
    while (app.next()) {
        var number = "/incident.do?sys_id=" + app.sys_id;
        var URL = "<a href=" + number + ">" + app.number + "</a>";
         html += "<tr><td style='width: 85px;'><b>" + URL + "</b></td><td  style='width: 120px;'><b>"  + app.assignment_group.getDisplayValue()  + "</b></td><td  style='width: 100px;'>" + app.caller_id.getDisplayValue() + "</td><td  style='width: 100px;'>" + app.opened_at.getDisplayValue() + "</td><td>" + app.short_description + "</td></tr>";
     }
    html += '</table>';
    template.print(html);
})(current, template, email, email_action, event);