Poly count is at the very bottom right of the screen.

In the note section for metadata write the info you want and turn on "burn into image"

[![enter image description here][1]][1]


A different way to see statistics is to enable the overlay in the 3D viewport as shown in this post:

https://blender.stackexchange.com/questions/177762/bottom-status-bar-doesnt-show-verts-faces-tris-information-in-v2-9a


[![enter image description here][2]][2]

I'm sure there has to be a way to make a script to do this automatically, but I'll leave that to those that know how to pull that off.


 [1]: https://i.sstatic.net/QQoJP.png
 [2]: https://i.sstatic.net/WHrwG.gif