Custom wallpapers in Raycast Wallpaper extension?

Is there any way to upload your own wallpapers to the Raycast Wallpaper extension? I love this tool, especially the Auto Switch feature. But Raycast’s built-in library is limited, so I’d like to be able to upload my own wallpapers and mark them as light or dark so they can switch automatically. If this isn’t possible right now, I really hope they add this feature at some point.