Basically the dealer or repair shop just needs to go into the air suspension control module with the PIWIS and add 20 millimeters to your current suspension settings input by the factory, you have to add to the number on the Macan to make the car go lower. They may try to subtract because this it how it works on the Cayenne and Panamera, but the Macan is different.
Here is an example of what they would do, these numbers are arbitrary, so do not use them in your own car.
Left Front original coding 414, they would add 20 to make it 434
Right Front original coding 416, they would add 20 to make it 436
Left Rear original coding 418, they would add 20 to make it 438
Right Rear original coding 414, they would add 20 to make it 434.
This is basically the logic behind it and these numbers do not mean anything, so do not input them into the car, I have no idea what your factory settings are as each car may be slightly different, they are set at the factory based upon many different parameters.
Also do this at you own risk, as I have no clue on how this will affect your warranty or the service life of the air suspension.
In my opinion, the car actually would look better if you lower the front by 10mm more than the rear, because of the shape of the wheel arches, sometimes the Macan looks as if it is squatting in the back.
Also 20mm is less than and inch and to be honest, it will not even look like you have lowered the car.