That's about what I expected the answer to be.
Many years ago a company I did some work for made up a cheap and dirty DCIB for some 480 volt conveyor motors by connecting two capacitors to two motor legs through a bridge rectifier and connecting the other side of the cap to the 3rd leg. This charged the caps to about 600 volts when the motor ran. A two pole relay in parallel with the bridge connected those two legs when the motor contactor shut off to discharge the caps. It wasn't elegant but it did work.
sound a nice idea. Just not sure how much braking power is obtained by uf lol ..Btw when an AC cap is installed directly parallèle to a motor after a motor contactor it would probably do the same at a certain point...when AC line open, the cap remain charged at it's last waveform state and discharge into the motor under a DC curent form....
I will make a test with a no load motor just for fun if it stop faster connected to a cap or not...