Slider image doesn’t load on Chrome with Smush plugin

I’m using the Smush plugin and enabled lazy loading.

The slider image doesn’t render on Chrome since there’s no image dimensions: An <img> element was lazyloaded with loading=lazy, but had no dimensions specified. Specifying dimensions improves performance.

Is there a way for me to add a class to all the Genesis slider images through the functions.php? I can then exclude the slider from using lazy loading.