The addition of additional states to the ICON and TEXT objects would allow for better visual effects such as a new texture, or an X + Y position.
It can follow the same 4 states of the SPRITE object.

Fortunately I think we only need two states (not hovered/focused and hovered/focused) because the disabled state is static for the lifetime of the button. The only reason the WidgetSprites object has the four states at the json level is because it's a vanilla object, and "real" buttons may have all four states.