suite/stock_delivery_route/views/partner_views.xml

<?xml version="1.0" encoding="UTF-8"?>
<odoo>
    <record id="view_partner_form_inherit" model="ir.ui.view">
        <field name="name">res.partner.form.inherit</field>
        <field name="model">res.partner</field>
        <field name="inherit_id" ref="base.view_partner_form" />
        <field name="arch" type="xml">
            <xpath expr="//group[@name='container_row_2']" position="after">
                <group name="container_row_delivery_routes">
                    <group string="Delivery Routes" name="delivery_routes">
                        <field name="delivery_route_ids" widget="many2many_tags" nolabel="1" options="{'no_create': True}"/>
                    </group>
                </group>
            </xpath>
        </field>
    </record>
</odoo>