Rear wiper retrofit wiring

[Skids_Croatia]

Hi guys,

Does anyone have any information or an advice regarding the rear wiper retrofit.
My car came without a rear wiper from the factory but the previous owner fitted a tailgate/trunk with a 3rd stop lamp and a wiper. The 3rd stop lamp was wired and works as it should. The wiper is not connected and my car is missing the wiper stalk with the "forward position" for activating the wiper.

So my question is, does anyone have a schematic (yes I have looked into troubleshot manuals from wedophones internet site but it is lacking information) or a specific list of parts, wires and connectors to retrofit the rear wiper. Basically, how to connect (and where) the rear wiper.

Thanks in advance!