Sorry I can't give you what you want, but realistically you're not going to find a true "Enabled=False" in a stand-alone label because a label does not have any actions associated with it. "Enabled=False" means that the action associated with that object is turned off. A command button is not eligible to be clicked, for example, and a text box will not accept text. A label doesn't have any actions, so there's nothing to turn off.
I don't know why you would want to disable something that doesn't have any abilities. If it's simply the formatting appearance you're after, could you perhaps create identical labels with one just behind the other in a slightly different position that is lighter that creates the etched appearance? It's not true "Enabled=False" but it might give a similar appearance.