whatsapp_web_groups/views/ww_contact_views.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <data>
        <record id="view_res_partner_whatsapp_tree" model="ir.ui.view">
            <field name="name">res.partner.whatsapp.tree</field>
            <field name="model">res.partner</field>
            <field name="inherit_id" ref="base.view_partner_tree"/>
            <field name="arch" type="xml">
                <xpath expr="//field[@name='complete_name']" position="after">
                    <field name="whatsapp_web_id"/>
                </xpath>
            </field>
        </record>

        <record id="view_res_partner_whatsapp_form" model="ir.ui.view">
            <field name="name">res.partner.whatsapp.form</field>
            <field name="model">res.partner</field>
            <field name="inherit_id" ref="base.view_partner_form"/>
            <field name="arch" type="xml">
                <xpath expr="//notebook" position="inside">
                    <page string="WhatsApp" name="whatsapp">
                        <group>
                            <field name="whatsapp_web_id"/>
                        </group>
                        <notebook>
                            <page string="Grupos">
                                <field name="group_ids" widget="many2many_tags">
                                    <list string="Grupos">
                                        <field name="name"/>
                                    </list>
                                </field>
                            </page>
                        </notebook>
                    </page>
                </xpath>
            </field>
        </record>

        <record id="view_res_partner_whatsapp_search" model="ir.ui.view">
            <field name="name">res.partner.whatsapp.search</field>
            <field name="model">res.partner</field>
            <field name="inherit_id" ref="base.view_res_partner_filter"/>
            <field name="arch" type="xml">
                <xpath expr="//filter[@name='type_company']" position="after">
                    <filter string="WhatsApp" name="whatsapp" domain="[('whatsapp_web_id', '!=', False)]"/>
                </xpath>
            </field>
        </record>

        <record id="action_res_partner_whatsapp" model="ir.actions.act_window">
            <field name="name">Contactos WhatsApp Web</field>
            <field name="res_model">res.partner</field>
            <field name="view_mode">list,form</field>
            <field name="domain">[('whatsapp_web_id', '!=', False)]</field>
            <field name="context">{'search_default_whatsapp': 1}</field>
            <field name="help" type="html">
                <p class="o_view_nocontent_smiling_face">
                    No hay contactos de WhatsApp
                </p>
            </field>
        </record>
    </data>
</odoo>