No, labels don't know the parent element's position.
This can only work if the user positions the label to a specific point of the parent.
If you want to label only a specific GDL object, you could try storing SYMB_POS_... globals into a parameter in the parent object, and getting it with REQUEST "ASSOCLP_PARVALUE" in the label.
Péter Baksa
Software Engineer, Library
Graphisoft SE, Budapest