Custom entity models with JSON files?

Hello,

I was wondering how I would make an entity a certain model with a provided JSON file and a UV texture (png).

This is my code for now:

public class headcrabRender extends ChickenRenderer{
	public headcrabRender(EntityRendererManager manager) {
		super(manager);
	}
	
	@Override
	public ResourceLocation getEntityTexture(ChickenEntity entity) {
		return new ResourceLocation(BaseMod.MODID, "textures/entity/headcrab.png");
	}
}

Thanks.