I am Posting Answer here
Yes We Can make .aab file without eas in expo
Steps
1.Go to the root folder of your Expo project.
2.Now change the directory to android using cd android
- Now write
./gradlew bundleRelease
4.Congrats your .aab file will be built. You can find your bundle file in 'android/app/build/outputs/bundle/app-release.aab' directory.