server-tools/auth_admin_passkey/views/res_config_view.xml

<?xml version="1.0" encoding="UTF-8"?>
<odoo>

        <record id="view_res_config_settings" model="ir.ui.view">
            <field name="name">base.config.settings.view</field>
            <field name="model">base.config.settings</field>
            <field name="inherit_id" ref="base_setup.view_general_configuration"/>
            <field name="arch" type="xml">
                <xpath expr="//label[@name='email_label']/.." position='after'>
                    <group>
                        <label for="id" string="Passkey"/>
                        <div>
                        <div>
                            <field name="auth_admin_passkey_send_to_admin" class="oe_inline"/>
                            <label for="auth_admin_passkey_send_to_admin"/>
                        </div>
                        <div>
                            <field name="auth_admin_passkey_send_to_user" class="oe_inline"/>
                            <label for="auth_admin_passkey_send_to_user"/>
                        </div>
                        </div>
                    </group>
                </xpath>
            </field>
        </record>

</odoo>