Embedding code in KB articles - requires extension?

Embedding code in KB articles - requires extension?

Currently, when editing articles in the Knowledge base part of Zoho Desk, there appear options to "insert code". Question is: what kind of code? Does this require a formal extension, approved by Zoho? Or any kind of code?

We are looking for ways to add simple apps to our knowledge base (example: a form that let's people add some info to a pdf builder and then get access to a downloadable pdf). Are there ways to do this? Anyone have experience or insight?