Hi Nick,
3rd party script installation is outside of our support scope and we will not be able to implement such a thing for you. But we will do our best to help you out doing it yourself.
Please install the Child Theme and add the code below to functions.php file:
add_action('wp_head', 'head_information', 9999);
function head_information () { ?>
<!-- Your HTML Code Here -->
<?php }
Replace <!-- Your HTML Code Here -->
with the code that is given to you by the 3rd party feature provider.
The method above is the standard way of adding additional HTML code to the head tag in WordPress and not related to specifically our theme. For more information about the actions and filters and best practices of the theme customization please read the articles below:
https://theme.co/apex/forum/t/customizations-actions-and-filters-in-x/208
Thank you.