Rendering Quill Js in PHP

Greetings, I am trying to render Quill js delta stored in the database in PHP with the help of https://github.com/nadar/quill-delta-parser/blob/master/README.md

The package is downloaded in Vendor. But I am unable to use it. Can you please throw some light on this matter?

Also are there any chances of an XSS attack as code will be rendered as HTML. If yes how to mitigate it or any other alternatives.