Custom block model has missing textures

I am trying to create a "crown" block but it will not load textures. I created it in Blockbench and exported it as a JSON file. When I loaded the model in, I added the textures in the mapping GUI. However, when I create a block in mcreator, it only gives me the option to load one texture: the bottom/main texture. How do I get my textures to load?

This is what my model is supposed to look like: