Aiming An item like a Crossbow

I am trying to make a ranged item that behaves similar to a crossbow, where you load it, it replaces itself with a loaded version, and MAINLY your character will lifts their arms forward while its loaded.

Is there a certain java-code that can allow me to call the animation while a certain NBT is active (like where the crossbow used the "loaded" NBT tag), or is there something else that I can do to achieve the same result.