reporting-engine/report_xlsx/views/header_footer.xml

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

    <record id="report_xlsx_hf_tree" model="ir.ui.view">
        <field name="name">report_xlsx_hf Tree</field>
        <field name="model">report.xlsx.hf</field>
        <field name="type">tree</field>
        <field name="arch" type="xml">
            <tree>
                <field name="name"/>
                <field name="hf_type"/>
                <field name="value"/>
            </tree>
        </field>
    </record>

    <record id="report_xlsx_hf_form" model="ir.ui.view">
        <field name="name">report_xlsx_hf Form</field>
        <field name="model">report.xlsx.hf</field>
        <field name="type">form</field>
        <field name="arch" type="xml">
            <form>
                <sheet>
                    <group>
                        <field name="name"/>
                        <field name="hf_type"/>
                    </group>
                    <div colspan="2"><i class="fa fa-info-circle" aria-hidden="true"/> Search in the <a href="https://xlsxwriter.readthedocs.io/page_setup.html#set_header">documentation</a> for set_header and set_footer to find the proper syntax to fill "Value" and "Options".</div>
                    <group>
                        <field name="value" placeholder="&amp;LHello &amp;CWorld &amp;R!!!"/>
                        <field name="manual_options" placeholder="{'margin': 0.3}"/>
                    </group>
                    <separator string="Images"/>
                    <div><i class="fa fa-info-circle" aria-hidden="true"/>
                    If you select an image, you don't have to specify any image options (image_left, image_data_left, ...) but you need to add the control character <span style="background-color: #ebecec;">&amp;G</span> in the value.</div>
                    <div>
                    If you add the three images, the value must contain <span style="background-color: #ebecec;">&amp;L&amp;G &amp;C&amp;G &amp;R&amp;G</span> or <span style="background-color: #ebecec;">&amp;L&amp;[Picture] &amp;C&amp;[Picture] &amp;R&amp;[Picture]</span>.</div>
                    <group>
                        <field name="image_left_name" invisible="1"/>
                        <field name="image_left" filename="image_left_name"/>
                        <field name="image_center_name" invisible="1"/>
                        <field name="image_center" filename="image_center_name"/>
                        <field name="image_right_name" invisible="1"/>
                        <field name="image_right" filename="image_right_name"/>
                    </group>
                    <separator string="Associated report(s)"/>
                    <field name="header_report_ids" attrs="{'invisible': [('hf_type', '!=', 'header')]}" nolabel="1" colspan="2"/>
                    <field name="footer_report_ids" attrs="{'invisible': [('hf_type', '!=', 'footer')]}" nolabel="1" colspan="2"/>
                </sheet>
            </form>
        </field>
    </record>

    <record id="report_xlsx_hf_action" model="ir.actions.act_window">
        <field name="name">XLSX Header/Footer</field>
        <field name="res_model">report.xlsx.hf</field>
        <field name="view_type">form</field>
        <field name="view_mode">tree,form</field>
    </record>

    <menuitem id="report_xlsx_hf_menu" parent="report.reporting_menuitem"
              name="XLSX Header/Footer" action="report_xlsx_hf_action" sequence="100"/>

</odoo>