how to add new item to analysis toolbar shopware backend?

Shopware 5
1

I want to add a new item in analysis window toolbar via extjs like this Screenshot by Lightshot

but still I cant see the results

here is my code

swag_custom_statistics/backend/view/main/voucher.js
//{namespace name=backend/analytics/view/main}
//{block name=“backend/analytics/swag_custom_statistics/view/main/voucher”}
Ext.define(‘Shopware.apps.Analytics.swagCustomStatistics.view.main.Voucher’, {
    extend: ‘Shopware.apps.Analytics.view.main.Toolbar’,
    alias: ‘widget.voucher-analytics-toolbar’,
    initComponent: function () {
        var me = this;
        Ext.applyIf(me, {
            items: [
                {
                    xtype: ‘button’,
                    text: ‘{s name=toolbar/export}Export2{/s}’,
                    name: ‘export2’,
                    iconCls: ‘sprite-drive-download’,
                    handler: function () {
                        me.fireEvent(‘exportCSV’);
                    }
                },
                
            ]
        });
        me.callParent(arguments);
    }
});
//{/block}

swag_custom_statistics/app.js

 

// {block name=“backend/analytics/application”}
// {$smarty.block.parent}

// {include file=“backend/analytics/swag_custom_statistics/store/navigation/voucher.js”}
// {include file=“backend/analytics/swag_custom_statistics/view/table/voucher.js”}
// {include file=“backend/analytics/swag_custom_statistics/view/main/voucher.js”}
// {/block}