No there is no need for any addon to make this work, you only need the model of the face and the details require like a laurel leaf around the circumference of the coin as an example.
Then you attach all these object and use ctrl+j to make them one. Now make a plane in blender and name it low poly coin and export it as obj in a folder.
Now export everything you join together for the face and detail as coin high poly.
Open Xnormal (free baking program) and load the high poly mesh in the first slot and then in the second load the low poly coin and go to bake options and chose height and normal + ambient occlusion to get nice shadow on the coin relief.
I am assuming you are already familiar with Blender a bit and general 3d software.
I almost forgot that i made a gif tutorial to show how to do this in Blender 2.79 since in 2.8 it is not working currently, here the tutorial and just replace the scales by your head and it is the same process ;