Well, Tuya microwave sensors are working, although I didn't have the time to experiment with all the different adjustment options.
Although they are rather chatty when activated, my Zigbee mesh handled it, I have practically not observed noticeable delays with other sensors and actuators.
BTW, there is a new model, much better looking than the previous
EDIT2: removed the link, as it turned out that this device not a mmWave radar, but just a PIR sensor with some advanced presence detection algorithms embedded into the sensor firmware.
The full range of Tuya Human Presence mmWave radars that are supported in Hubitat by a custom driver is here.
