Update the activity class parameter of type CDT from the plug-in

Team,

We have a custom servlet which ends the Appian task and populates the activity class parameters through Java code. For normal activity class parameters, it's easier. But for CDT, I am facing some difficulty writing the logic. I know I would have to play with TypedValue, TypeService, and Hash<TypedValue, TypedValue>. But I am struggling to set up the Hash<TypedValue, TypedValue> for the cdt I wish to update.

Thanks,
Akshar