Dear @dmncn
If you wish to apply this to normal ' images' and you find no way to do so with the Customizer, you can always add some Custom CSS within 'Lay Options - Custom CSS & HTML"
A basic setup that shows the two needed things for the zoom, Scale & Transition ( technically you dont need the transistion, but then i would just jump and no "effect" would really take place )
.img{
transition: transform .2s;
}
.img:hover {
transform: scale(1.5);
}
https://www.w3schools.com/howto/howto_css_zoom_hover.asp
This will target all images across your website, you will probably wish to refine what you target with hover :)
Best wishes and Talk soon! :)
Richard