Fellow shipmate! We're in the same boat, as I'm wondering the same exact thing for my future desk. I'm currently toying with the idea of a retractable grommet with USB ports - something like to this: https://www.amazon.com/dp/B097D28MR2/ref=cm_sw_r_apan_glt_fabc_66313Z6C3HA2JKDJ8ZT7

This is only an alternative though - I really wanted something more like what you described though, where the cord itself would be retracted. Because even if we have the above grommet, we still need to keep the cord handy.

Interested to see what other folks have done though.