Google recommends using the new Android App Bundle format for apps uploaded to Google Play. When you upload an APK a warning is displayed which encourages to use the newer format.
You should be able to generate the bundle using command prompt (cmd)
cordova build android --release -- --packageType=bundle
With Android Studio:
The steps are:
- Launch Android Studio
- Go To Import Project (Eclipse ADT, Gradle, etc).
- Select Android platform directory in your project (/platforms/android).
- Wait for finish the Sync
- Go to Build > Generate Sign Bundle
- Complete Signing info
- Upload de .aab file generated (in path /platforms/android/outputs/