Custom bow + pull textures

im trying to make a retextured version of the bow, and ive got the main texture working. However, im not sure exactly how to go about having my own version of the pull textures without changing the base texture. Is there some sort of special thing you can do in the model json for it that lets you set pull textures? preferably without using custom model data as im using the item_model component instead, but if its required i will use it.