server-tools/excel_import_export_demo/report_action/partner_list/templates.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>

    <record id="partner_list_xlsx_template" model="xlsx.template">
        <field name="res_model">report.partner.list</field>
        <field name="fname">partner_list.xlsx</field>
        <field name="name">Partner List Report Template</field>
        <field name="description">Sample Partner List Report Template for testing</field>
        <field name="input_instruction">
            {
                '__EXPORT__': {
                    1: {
                        'results': {
                            'A4': 'id',
                            'B4': 'name${value or ""}#{style=text}',
                            'C4': 'phone${value or ""}#{style=text}',
                            'D4': 'email${value or ""}#{style=text}',
                        }
                    }
                },
            }
        </field>
    </record>

    <function model="xlsx.template" name="load_xlsx_template">
        <value eval="[ref('partner_list_xlsx_template')]"/>
    </function>

</odoo>