whatsapp_web_groups/whatsapp_web_mail/views/res_partner_views.xml

<?xml version="1.0" encoding="UTF-8"?>
<odoo>
    <data>
        <record id="view_res_partner_form_inherit_whatsapp_notifications" model="ir.ui.view">
            <field name="name">res.partner.form.whatsapp.notifications</field>
            <field name="model">res.partner</field>
            <field name="inherit_id" ref="base.view_partner_form"/>
            <field name="arch" type="xml">
                <xpath expr="//sheet/notebook" position="inside">
                    <page string="Notificaciones WhatsApp">
                        <field name="whatsapp_notification_ids"/>
                    </page>
                </xpath>
            </field>
        </record>
    </data>
</odoo>