oh 
Maybe he wants
<script type="text/discourse-plugin" version="0.4">
api.decorateWidget('header-icons:before', helper => {
return [
helper.h('li', [
helper.h('a#premium-button.icon', {
href: '/link.html',
title: 'Premium Content'
}, helper.h('i.fa.fa-cloud.premium-button-icon.d-icon')),
])
];
});
</script>