Odoo-18.0-20251222/sale_stock_picking_note/views/report_deliveryslip.xml

<odoo>
    <template
        id="report_delivery_document_customer_note"
        inherit_id="stock.report_delivery_document"
    >
        <xpath expr="//table[@name='stock_move_line_table']" position="after">
            <p t-if="o.customer_note">
                <strong>Customer Comments:</strong>
                <br />
                <span t-field="o.customer_note" />
            </p>
        </xpath>
    </template>
</odoo>