Can WP Smush Pro smush theme images?

I was using hummingbird on some of my sites, and noticed that it gave really poor scores on compress images. So I installed wp smush pro, and smushed all of my images. However, it only smushed the images in my uploads, which is a very small portion of my site's total images (as my site is not an image-heavy site). The large majority of images on my site are from the theme(s) I use. Is there any way wp smush pro can be updated to smush theme images as well, if it doesn't already? Bonus points if it also smushes new and updated images for themes that are updated.