How to Shuffle / Randomize images in macOS Photos Slideshow?

I'm creating a slideshow project on my Mac via Photos.app I've added 300+ images to the slideshow. I want them to appear in a random order. Randomization of a slideshow should be an extremely commonly desired feature. However, Photos.app does not appear to have any option to randomize or shuffle the photos. I'm able to manually re-order the timeline of photos at the bottom, but that's too much work for a large slideshow. How can I display a randomized slideshow in macOS Photos?