Bafang's OEM Area lists all of their motors and all of their drive systems. The following motors appear to have a torque sensor:
MM G510.750/1000.C (a.k.a. "M620", "Ultra", or "Ultra Max") - 750/1,000W mid motor
MM G521.500.C (a.k.a. "M600") - 500W mid motor
MM G330.350.CCB (a.k.a. "Max") -...