Platform: mitemp_bt and unique_id

Configuration
1 
- platform: mitemp_bt
  mac: 'A4:C1:38:xx:xx:xx'
  name: FamilyRm Temp Xib86e
  unique_id: "ble.FamilyRm Temp Xib86e"

results in config error:

Invalid config for [sensor.mitemp_bt]: [unique_id] is an invalid option for [sensor.mitemp_bt]. Check: sensor.mitemp_bt->unique_id. (See ?, line ?).

How to give unique_id for - platform: mitemp_bt sensors?