[NTG-context] Label in externalfigures

Dear Members! I have a question on how to achieve something like this. \IncludePicture[picture.pdf][xpos=2, ypos= 4, label=some text] I know there is a similar function in the simple slides module but I need it in my documents, often exams to my students, so caption is mainly not necessary. The background to this is that I often creating pictures in Inkscape and export it to pdf but sometimes I do screenshots and save it in .png or .pdf format. So I just want to put labels in it like a layer in same size as the included picture. Or is this something that’s already solved so "reinventing wheel" is unnecessary? Thanks in advance Jan-Erik