2008 Clock and Temp Control Lights - Can they be dimmed?

Just like the title of my post asks, is there a way to dim the clock and temp control lights in the dash of a 2008 Sienna XLE AWD to be specific? I like a dim dash on really dark drives and those are the only sets of lights that I cannot locate a dimming control to operate them. If these can't be dimmed as is, has anyone found a way to add a pot or rheostat to the light circuit? Thanks!