Can't you just manually provide the directly URL of IData_xChangeService.Get_Abteilung_JSArray method to the LoadFromJSON method?
Perfect! In my example case it is 'http://localhost:8000/tms/xdata/Data_xChangeService/Get_Abteilung_JSArray'
One more question. I am missing the Col Titles. I have a JSArray like below:
That's up to the server-side. I don't know how your server-side is implemented.