The following Client Script worked. Anyway thanks @NCP
var sortedEntries = frm.doc.passport_details.sort(function (a, b) {
var dateA = new Date(a.expiry_date);
var dateB = new Date(b.expiry_date);
return dateB - dateA;
});
frm.set_value('passport_details', sortedEntries);
frm.refresh_field('passport_details');
Reference: