Export Excel sheet from table using custom labels

[Are Kaveri]

Hi 

I am working on below script building script to export data in form of excel and send it .

but i used one method GlideExcel workbook . when i run in background script it throwing errors..

Any one has idea how to export excel without using below method.

var ExportHelper = Class.create();
ExportHelper.prototype = {
    initialize: function() {},

    exportTableToExcel: function() {
        this.exportTable('table_1', 'exportdata.xlsx', [{
                field: 'sys_id',
                label: 'ID'
            },
            {
                field: 'type',
                label: 'TYPE_C'
            },
            {
                field: 'group',
                label: 'GROUP__C'
            },
               ]);
       
        this.exportTable('x_customer_case', 'CaseExportData.xlsx', [{
                field: 'sys_id',
                label: 'ID'
            },
            {
                field: 'number',
                label: 'CASENUMBER'
            },
            {
                field: 'sys_created_on',
                label: 'CREATEDDATE'
            },
            {
                field: 'sys_updated_on',
                label: 'LASTMODIFIEDDATE'
            },
            {
                field: 'substate',
                label: 'STATUS'
            },
          
            {
                field: 'order_date',
                label: 'INCIDENT_DATE1__C'
            },
          
            {
                field: 'order_time',
                label: 'TIME_OF_DAY__C'
            },
          
         
            {
                field: 'description' + '' + 'work_notes',
                label: 'DESCRIPTION'
            },
            
            {
                field: 'assigned_to',
                label: 'Assigned_to_C'
            }
        ]);
    },
    exportTable: function(tableName, fileName, fields) {
        var workbook = new global.GlideExcelWorkbook();
        var sheet = workbook.createSheet('Export');
        // Add header row
        var headerRow = [];
        for (var i = 0; i < fields.length; i++) {
            headerRow.push(fields[i].label);
        }
        sheet.addRow(headerRow);
        // Query and add data
        var gr = new GlideRecord(tableName);
        gr.setLimit(100); // Adjust as needed
        gr.query();
        while (gr.next()) {
            var row = [];
            for (var j = 0; j < fields.length; j++) {
                row.push(gr.getValue(fields[j].field));
            }
            sheet.addRow(row);
        }
        // Write Excel file as attachment
        var stream = new global.GlideExcelStreamWriter(workbook);
        var attachment = new GlideSysAttachment();
        attachment.write(current, fileName, 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', stream.toStream());
    },



    type: 'ExportHelper'
};

Anyone has any approach for below scenario.

To export data from a table with Custom header other than column names.

tables can be more than 3 tables data.