I want to add an embedded MailChimp script to my Magento 1 installation. However, the script has an attribute:
<script type="text/javascript" src="//downloads.mailchimp.com/js/signup-forms/popup/embed.js" data-dojo-config="usePlainJson: true, isDebug: false"></script>
(the data-dojo-config attribute)
How can I add this attribute using the addItem method?