Add Information of a Field in KM document

Hi Experts. 

Currently I have a request of customer. 

We need add some information in KM Document. 

I saw that the form is a HTML.  But they mencioned if exists information like Document ID, Document Type, then it is posible add information of another field. 

My question is: Is it posible add Information of another field? 

Because I view de FD and the input of the tool HTML Editor is an Varialble. 


I hope you help me.