reporting-engine/report_label/views/report_paperformat_label.xml

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

    <record id="paperformat_label_view_form" model="ir.ui.view">
        <field name="model">report.paperformat.label</field>
        <field name="inherit_id" ref="base.paperformat_view_form"/>
        <field name="mode">primary</field>
        <field name="arch" type="xml">
            <!-- Hide irrelevant fields -->
            <field name="header_line" position="attributes">
                <attribute name="invisible">1</attribute>
            </field>
            <field name="header_spacing" position="attributes">
                <attribute name="invisible">1</attribute>
            </field>
            <field name="report_ids" position="attributes">
                <attribute name="invisible">1</attribute>
            </field>
            <!-- Add label paper format fields -->
            <form position="inside">
                <group name="label">
                    <group name="label_size" string="Label Size" colspan="2">
                        <field name="label_height"/>
                        <field name="label_width"/>
                    </group>
                    <group name="label_padding" string="Label Padding">
                        <field string="Top (mm)" name="label_padding_top"/>
                        <field string="Right (mm)" name="label_padding_right"/>
                        <field string="Bottom (mm)" name="label_padding_bottom"/>
                        <field string="Left (mm)" name="label_padding_left"/>
                    </group>
                    <group name="label_margin" string="Label Margin">
                        <field string="Top (mm)" name="label_margin_top"/>
                        <field string="Right (mm)" name="label_margin_right"/>
                        <field string="Bottom (mm)" name="label_margin_bottom"/>
                        <field string="Left (mm)" name="label_margin_left"/>
                    </group>
                </group>
            </form>
        </field>
    </record>

    <record id="paperformat_label_view_tree" model="ir.ui.view">
        <field name="model">report.paperformat.label</field>
        <field name="arch" type="xml">
            <tree string="Label paper format configuration">
                <field name="name"/>
                <field name="label_height"/>
                <field name="label_width"/>
            </tree>
        </field>
    </record>

    <record id="paperformat_label_action" model="ir.actions.act_window">
        <field name="name">Label paper format configuration</field>
        <field name="res_model">report.paperformat.label</field>
        <field name="view_type">form</field>
        <field name="view_mode">tree,form</field>
        <field name="domain">[]</field>
        <field name="context">{}</field>
    </record>

    <menuitem
        id="paperformat_label_menu"
        name="Label Paper Formats"
        action="paperformat_label_action"
        parent="base.reporting_menuitem"
        sequence="2"/>

</odoo>