You should add the license into metadata for the asset packs:
"Edit asset pack->Metadata->Release Info->License for assets"
It will increase the size of audience that will be able to find your art
Viewing post in Pixel Art Wooden Font v1 comments
You can leave a comment here to support my proposal about making metadata visible for those who are interested in it https://itch.io/t/2919128/metadata-encouragement#post-7952450