The oposite of Strip Operation Attribute ??

Hello,

In my Loop Back driver, I receive a creation event of a user, in the logs of my driver I notice the XML input into the driver (the user data)

when I do "Strip Operation Attribute" on a given attribut it disappears

What I want to do is the opposite of "Strip Operation Attribute", but no "Add Operation Attribute" is available, I would like to add some attributs to my input entry in "Input Transformation Policy"

what must I use ? set default attribut value ? set source attribut?

I dont want to see in the logs any add attribut operation, I want just after aplying the ploicy in "Input Transformation" to see the attribut in the user data

I will be grateful if you give me some dirxml samples

Regards,