If we connect the Xiaomi smartphone to the car, we can share the stored contacts via Bluetooth, for example, to use voice control from compatible car radios and dial contacts directly.

Android 10 (MIUI 12.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Bluetooth
Step 3:  Open the  devices settings
Step 4:  Enable or disable  Contact sharing
  1. Open the Settings
  2. Tap on Bluetooth
  3. Open the devices settings
  4. Enable or disable Contact sharing

Xiaomi Instructions