I was just about to submit this request myself. It would be tremendously useful for optimizing eero placement and identifying hardware issues. Much more information rich than the connection quality because it allows me to see my losses at each hop, even if the placement is relatively good.
Being able to run the speed test from your leaf nodes would be a great addition for troubleshooting/testing placement. Sure, the connection bars are helpful, but real numbers are always better! (It sure beats plugging in a laptop to each node to run the test by hand, which yes, I have done).