Synchronize Manager Name to Sources

Hi Everyone,

We are currently working to create accounts in an application through WebServices and we have to push the name of the manager.

We are able to create the accounts with the correct value but nn case of manager change, the following value is pushed to the application:
{displayName=Manager DisplayName, name=Manager ID, id=IDN ID, type=IDENTITY}

We search a way to push only the value listed in DisplayName to the application.

For now, we have add this line in the body for Update Account action:
"App_Attribute_Name": "$plan.manager$"

Is there an easy way to get this specific value ?

Thanks in advance.