Required Employee Name Instead Employee ID

I Have ERPNEXT V13 in the material request form Employee field is mandatory and its showing Employee ID I want Employee Name to show please guide how I can do it

Add one more custom field and keep datatype Data then add employee.employee_name in Add Fetch Option.

not showing

try this

frappe.ui.form.on('Material Request', 'before_Save', function(frm) {
        frappe.db.get_value('Employee', {'name':cur_frm.doc.emp}, 'employee_name')
        .then(response => {
        frm.doc.emp_name = response['message']['employee_name'];

not working

checked this option in employee doctype > customized form

This option is not available in ERPNEXT V13