Zendesk custom widget implementation

So the problem I need to solve is passing name, email, description/message in the zendesk web widget. The name and email are fine but the description is not supported by their code so the only way is to develop a new widget.

https://github.com/zendesk/zopim-chat-web-sdk-sample-app

This is the link to the widget. The only thing I need is to pass values in that widget.