Hello Corsenia,
The attribute of the shape can be set as a label via Python script. The following example will find all shapes with NAME attribute and set their label according to the value of this attribute:
import Metashape
ATTR = "NAME"
for shape in Metashape.app.document.chunk.shapes:
if ATTR in shape.attributes.keys():
shape.label = shape.attributes[ATTR]
As for the position of the shape label in the Model/Ortho/Photo view it is not customizeable in the current version.