A new field for HTML code

Inside my WP website I have WP Job Manager Field Editor module for the listing fields on the website. I want to create a new field type - textarea box, and with the use of Custom Field Widget (is part of the module) to be able to display on the front-end this type of code (to be displayed graphically not the code): <div id="xxxxxxxxx"> </div><script async="true" type="text/javascript" src="[login to view URL]"></script> (the code will be different for every listing) I've uploaded screenshots with the module and the widget. None of the field types and outputs work with my code so a new type must be created that will output graphically the code, being and looking as part of the website.