Create background animation with preloader plus

Hi !

I start with WordPress and discover your preloader which is awesome.

I already managed to integrate my image for the loader and also a background-image .
my background-image is a theater curtain image, and I was wondering if it was possible to add an animation to the preloader so that when loading, the background image makes an animation of opening curtains?

I can do it without the preloader but I would really like to be able to do it with it, is it possible?

Thanks for your help !
Have a nice day