Shift function imitate macro help

Hi there, I unfortunately need some help with a macro creation. I am looking for a way to press a key and thus how shift works. Without it being a shift. Unfortunately, I can't describe it better, which is why I have difficulties looking for it. As an an example: If I press the button down and the output should be 2, as long as I keep the button pressed, there should be no further output. Only when I let go of the button should output be 1, but only once. I hope I am describing this clearly and correctly. If the key is not pressed, nothing should be output, if it is held down, the 2 should be output once. As soon as it is released, the 1 should be output once. The way shift works. Is the function possible in a macro? Google wasn't very helpful with my search.