The example for using JSON (https://wiki.keyboardmaestro.com/action/Set_JSON_Value) doesn't seem to work.
First it says to do this:
Then it says to do this:
But when I do the second statement, it doesn't just change the first name, it also erases the last name from J, as you can see at the bottom of this image:
There's a 99% chance I'm simply confused here. Why am I confused? How do I change only one item?