I suggest you prepare semitransparent image with the descriptions. To watchface add one complely transparent image same size and shift it off-centre so, that only part of it on edge will remain over the watchface for touch. Set it as button and make it change image to your prepared descriptions. Then add plain number in the placement coordinate expression to even out the shift you done. Read this thread for better understanding How to make changeable watch hands with fixed tapping area? dont mind it is about hands, your image will not rotate, but principle of separating touch area from display area is the same.