I were able to find the token inside Filza on a jailbroken iOS device btw:
In the file /var/Containers/mobile/Data/Application/2E3DA69C-60A6-4C90-B981-83.../Library/Preferences/com.roborock.smart.plist
You can find the field RRIoTDeviceListCache_XXXXX containing a json-string where you can find the duid (device-id) and localKey (token).