Image in Genre header

Hi Everyone

I have just installed roon and trying it out. So far, very impressed and I think I will be paying up long before my trial is up.

One question. When I select to view my files by Genre I see some Genre’s that do not have a representative artist in the box just a generic place holder gray graphic. How do I replace that with an image. I have looked but can’t find an option similar to the same issue on the artist page?

Thanks in advance