Syntaxe to retreive variable value while creating another variable

I’m looking for a way to get the value from a variable in order to define a new variable.
Here is the definition of the first variable

As you can see, there is one value returned : “Main Org.”
I want to use “Main Org.” in this field :

But when i put $orgName I do not retreive “Main Org.” but “Main Org.”

Can anyone help me ? I’m using json simple datasource