if you have this fill graph as extension, you should save it in folder: Extension withion your Qlik Sense, but one more little thing for you: Qlik Sense has an default extension called: People Chart (Extension), maybe this chart suits better to your issue. (please see attached screenshot)
We can use that extension but I think there is a problem i.e. No of human images will be displayed as per the size of the object and there is no show value kind of option. If the user wants to know the value, he/she has to hover the mouse on to that chart.
I'm not sure how it is working now but I tried it couple of months ago.