You can try first from GUI, and when the dialog opens, choose the popup menu near the top, which has the last entry as "Generate Script". This will produce the needed LabTalk code on the command window. For your case, the likely problem is with the sheet is needed, so maybe the following
impOPJ fname: = C:\Users\francesco\Desktop\file.opj info.wkspage:=Book1 info.wks:=Sheet1 info.cols:={0,1} options.FirstMode:=1 orng:=[Book1]Sheet1!(1 ,2);
CP