partner-contact/nominatim_geolocalize/views/res_partner.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
        <record id="res_partner_nominatim_form" model="ir.ui.view">
            <field name="name">res.partner.geolocation.inherit</field>
            <field name="model">res.partner</field>
            <field name="inherit_id" ref="base.view_partner_form"/>
            <field name="arch" type="xml">
                <xpath expr="//notebook[last()]" position="inside">
                    <page string="Geolocation" name="geo_location">
                        <group>
                            <group>
                                <button string="Geolocate" name="geo_localize" icon="fa-check" type="object"/>
                            </group>
                            <group>
                                <field name="date_localization" />
                                <field name="partner_latitude" />
                                <field name="partner_longitude" />
                            </group>    
                        </group>
                    </page>
                </xpath>
            </field>
        </record>
</odoo>