Cropping tool - Possible to show an overlay of two different aspect ratios?

I have searched and have not been able to find any info. on this. I am cropping images to 16:9 (and using generative expand when needed), but I also want them to fit within a 4:3 aspect ratio as I'm using the same file for both. I assume this doesn't exist, but it would be great if the cropping tool had an option to show an overlay of another aspect ratio as you cropped. So as you are cropping to a 16:9, the overlay would also show you another selected ratio. I know I can switch to 4:3 to see if it will fit that as well, but just thought it would be a useful feature. Thanks.