@Greenman’s answer was correct but you need to adjust preArgs in order to send the appropriate numbers of midi arguments. For example, setting preArgs to 1 (ie channel 1) would let you define each item in values as a [note_number, velocity] pair.
The other way around this would be very similar to a previous request of yours (One button widget that sends different values to multiple CC's) except you’d need to use conditions (if…else) to define the values you send based on the switch’s value.