magento-test/app/code/Magento/Customer/Test/Mftf/Metadata/CustomerCreateNewAccountMeta.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--
 /**
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
-->

<operations xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:mftf:DataGenerator/etc/dataOperation.xsd">
    <operation name="CustomerCreateNewAccountOptionsConfigState" dataType="customer_create_new_account_config" type="create" auth="adminFormKey" url="/admin/system_config/save/section/customer/" method="POST">
        <object key="groups" dataType="customer_create_new_account_config">
            <object key="create_account" dataType="customer_create_new_account_config">
                <object key="fields" dataType="customer_create_new_account_config">
                    <object key="auto_group_assign" dataType="auto_group_assign">
                        <field key="value">string</field>
                    </object>
                    <object key="viv_on_each_transaction" dataType="viv_on_each_transaction">
                        <field key="value">string</field>
                    </object>
                    <object key="vat_frontend_visibility" dataType="vat_frontend_visibility">
                        <field key="value">string</field>
                    </object>
                </object>
            </object>
        </object>
    </operation>
</operations>