<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
    <head>
        <!-- Add local resources -->
        <script src="Enexum_CamposCheckout::js/funcionesCamposCheckout.js"/>
    </head>
</page>