New devices, such as Pixel 10 already support channel sounding.
Basically it's alternative to UWB.
One phone sends signals on multiple frequencies, another receives them. Obviously devices should be connected via BT.
Also tracking people already works with BT/WiFi RSSI (signal strength). Channel Sounding works better because it works even when the signal line of sight is obstructed, for ex. headphones lost under pillow.