contact_form.html

<div id="feedback-form">form will be placed in here</div>

<script type="text/javascript"
        src="{{ site.directory.vendor | append: 'jquery/dist/jquery.min.js' | strip | relative_url }}">
</script>
<script id="zammad_form_script" src="https://{{ site.helpdesk }}/assets/form/form.js"></script>

<script>
$(function () {
    $('#feedback-form').ZammadForm({
        messageTitle: 'Contact HIFIS',
        messageSubmit: 'Submit',
        messageThankYou: 'Thank you for your request (#%s). You will hear from us soon!',
        attachmentSupport: true,
        noCSS: true,
    });
});
</script>