Advice for edge coverage comparison

Hello, I am interested in comparing the edge coverage of two inputs using Atheris, regardless of the language under test. AFL has a tool called afl-showmap that allows the user to dump the edge coverage of a single input as a bitmap to a file. I would like to achieve similar functionality with Atheris. My hope is that I can hook into the underlying bitmap Atheris represents coverage with and dump it. This would allow me to compare edges covered in both Python and C code. Any advice on how to go about this would be appreciated!