server-tools/excel_import_export/views/webclient_templates.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!--
  Copyright 2019 Ecosoft Co., Ltd. 
  License LGPL-3.0 or later (https://www.gnu.org/licenses/lgpl.html).-->
<odoo>
    <template id="assets_backend" inherit_id="web.assets_backend">
        <xpath expr="." position="inside">
            <script type="text/javascript" src="/excel_import_export/static/src/js/report/action_manager_report.js"/>
        </xpath>
    </template>
</odoo>