reporting-engine/report_xlsx/demo/report.xml

<?xml version="1.0" encoding="UTF-8" ?>
<odoo>
    <!--
    © 2017 Creu Blanca
    License AGPL-3.0 or later (https://www.gnuorg/licenses/agpl.html).
    -->
    <record id="partner_xlsx" model="ir.actions.report">
        <field name="name">Print to XLSX</field>
        <field name="model">res.partner</field>
        <field name="report_type">xlsx</field>
        <field name="report_name">report_xlsx.partner_xlsx</field>
        <field name="report_file">res_partner</field>
    </record>
</odoo>