Toggle visibility of layer list via JSON state

Is there an option to toggle the visibility of the layer list (not the layer list panel, but the list of layers on top of the image data), as well as the top-most bar (with the coordinates etc.) via JSON state attributes? This would be quite useful when embedding predefined neuroglancer instances as iframe in website where one does not want these controls to be immediately visible (of course the keyshort cuts would still work).