I do not believe so, at least not to my knowledge. There's definitely no button on the keyboard for this. Now that you mentioned that, it definitely would come in handy.
The Belkin qode pro can do this and I didn't think it was such a big deal until I started incorporating my iPad into my work flow.
The belkin can act as a Bluetooth keyboard for both my MacBook and iPad.
I just upgraded to an iPad Air 2 and it looks like I may be sticking with the belkin