Tilde is a temporary 'pan-around-the-character' solution, is it not? It doesn't actually change the zoom level for gameplay. As well, there /is/ nothing in the controls for there. There is the 'zoom in closer for sake of viewing further away' option, but that is not at all what is being asked about.
What is being spoken of is whether there is a means to control the zoom level when in third person view. For this, there is nothing in the controls, if it is indeed even possible.