Hi,
You can generate a ftl file for the human task created.This is eclipse editor (2nd image).
Same can be done in guvnor repository also. Check the 1st image and click the button under red circle. Hope this answers. https://community.jboss.org/servlet/JiveServlet/downloadImage/2-748428-19020/450-149/guvnor.png
https://community.jboss.org/servlet/JiveServlet/downloadImage/2-748428-19019/450-473/jbpmform.png