One way I can think of is to add the data in article text body by dynamically adding the service offering when knowledge state changes to publish this can be done by before update business rule where condition will be state "changes to publish", PFB the example code in which I am adding valid to to article text body from before update BR
(function executeRule(current, previous /*null when async*/) {
// Add your code here
var text = current.text;
var addnewtext = "<h1>Valid to</h1> : "+current.valid_to.toString() + "/n"; // Add valid to dynamically in content body
var finaltext = addnewtext + text;
current.text = finaltext;
})(current, previous);
