Zend certified PHP/Magento developer

Render HTML in form_additional_info position in customer edit page

I need to display a custom customer field at form_additional_info position in the edit.phtml template.

The default edit.phml contains this instruction:

<?= $block->getChildHtml('form_additional_info') ?>

So, in my custom customer_account_edit.xml file I had:

<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
    <body>
        <referenceBlock name="customer_edit">
            <block class="MagentoFrameworkViewElementTemplate"
                   name="form_additional_info"
                   template="Vendor_Core::customer/additionalinfocustomer.phtml"/>
        </referenceBlock>
    </body>
</page>

however, my custom template is not shown.

By seeing the default customer_account_edit.xml file, this is the content:

<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
    <update handle="customer_account"/>
    <body>
        <referenceBlock name="head.components">
            <block class="MagentoFrameworkViewElementJsComponents" name="customer_account_edit_head_components" template="Magento_Customer::js/components.phtml"/>
        </referenceBlock>
        <referenceBlock name="page.main.title">
            <action method="setPageTitle">
                <argument translate="true" name="title" xsi:type="string">Edit Account Information</argument>
            </action>
        </referenceBlock>
        <referenceContainer name="content">
            <block class="MagentoCustomerBlockFormEdit" name="customer_edit" template="Magento_Customer::form/edit.phtml" cacheable="false">
                <container name="form.additional.info" as="form_additional_info"/>
            </block>
        </referenceContainer>
    </body>
</page>

So I thought I should reference customer_edit block and define form.additional.info block inside, but it did not work.

Any help?