I am still a newbie here and apologise if this is already known.
As I am partially sighted I rely quite heavily on images to help me out.
As most OS and Major apps these days support folder.jpg, I use this a lot over my network to assist me in knowing what I am trying to find.
I have found that Jellyfin also supports folder.jpg and thus allows me to see quite well what my libraries are.
I hope this helps others.