/////////////////////Item class//////////////////////
public class EntityStorageItem extends Item {

    public EntityStorageItem(Properties pProperties) {
        super(pProperties);
    }

    public InteractionResult useOn(UseOnContext pContext) {

        ItemStack is = pContext.getItemInHand();
        CompoundTag tag = is.getTagElement("stored_entity");
        BlockPos pos = pContext.getClickedPos();

        if(tag != null){

            Entity entity1 = EntityType.create(tag, pContext.getLevel()).get(); // method 1

            pContext.getLevel().addFreshEntity(entity1); // method 2

            entity1.moveTo(pContext.getPlayer().position());

            Entity entity = EntityType.loadEntityRecursive(tag, pContext.getLevel(), (p_138828_) -> {
                p_138828_.moveTo(pos.getX(), pos.getY(), pos.getZ(), p_138828_.getYRot(), p_138828_.getXRot());
                return p_138828_;
            }); // method 3 from SummonCommand

        }
        return InteractionResult.PASS;
    }
}

////////////////////////Entity class (partial)/////////////////////////
public class ExampleEntity extends Animal {

    @Override
    public InteractionResult mobInteract(Player pPlayer, InteractionHand pHand){

        ItemStack items = pPlayer.getItemInHand(pHand);
        Item item = items.getItem();

        if(item instanceof EntityStorageItem && pPlayer.isCrouching()){
            CompoundTag tag = new CompoundTag();
            this.save(tag);
            items.addTagElement("stored_entity",tag);
            //this.discard();


        }

        return super.mobInteract(pPlayer, pHand);
    }


}