can’t recommend scales, but I can say that I’ve looked at the integration part of it and If it’s w/ GC, Intervals.icu pulls data from it (but not all for some reason). Barring that, you also have 3rd party websites that will sync from A → B (but again, there will be hits and misses)
Withings does provide an API, so you can also write your own to pull and push into GC I presume.