How to get url of selected image in google images?

I write Automator workflow which will attach google image miniature, able to be selected on context menu or hotkey enabled.

Now I am trying to figure out which type of object sees Automator when I right-click on image in safari. I tried web-content, image, documents, everything else, but nothing works.

Also I tried actions like Get opened safari document + load images from web-content, but it is not my case.

Is it possible at all, to add context menu option to google image?