How to communicate with native in background.js of @capacitor/background-runner

I want to automatically connect to Bluetooth and upload data after a certain period of time after the app enters the background. I found that @capacitor/background-runner can achieve this timing requirement. However, in the background.js runtime environment, there is no window or Capacitor, and other plugins such as (@capacitor-community/bluetooth-le, @capacitor/filesystem) cannot be used. So I wanted to implement it myself, but I couldn't find a way to notify the native execution of Bluetooth connection in the background.js runtime environment.