It's not possible to "download' the dataset from your car. Instead, you can look in the list of example datasets for your car type and brand. Don't worry if you don't find your specific car. Most datasets can be used on multiple cars. For instance, a Passat dataset can also be used on Leon, Golf, GTI, GTE, Arteon, Superb, etc. Incompatibilities can occur, when you select a dataset that was meant for a car with a different mode-button setup than yours. For instance: Tiguan has a knob, while Passat has a button. Don't worry, your car will not be bricked when you flash a dataset which isn't compatible. Just flash another one, and try again.
If you have access to ODIS Online, you can get the exact same dataset for your car. ODIS saves the datasets here during parametrisations:
C:\Program Files (x86)\Offboard_Diagnostic_Information_System_Service\configuration\org.eclipse.osgi\bundles\114\data\dms2\