Share between engines

**Question**
I have a case:
I have a native project and use the Flutter engine (Flutter Module) and We must call that engine multiple times to save some keys to the box.
Sample: Activity A contain engine_1 ---> Activity B contain engine_2
So I want to set engine 2, hive box does not notify for engine 1 (it does not refresh)
Is there any way to handle it?
Thank you.

**Code sample**
```dart
Provide a few simple lines of code to show your problem.
```

**Version**
- Platform: iOS, Android, Mac, Windows, Linux, Web
- Flutter version: [e.g. 1.5.4]
- Hive version: [e.g. 0.5.0]

Reproduce the Activity A/Activity B setup with two Flutter engines and a shared Hive box, then inspect the box-notification behavior. Confirm whether writes from engine_2 are visible to engine_1 and document the supported handling or required change.

Written by the indexing model from the issue text.