This is the follow-up for the issue mentioned in #98702 since the issue has been closed without any working solution provided.

Issue: None of the following documents explains how to do the integration test migration for the "app-to-app" case, where we are supposed to use the "--use-existing-app" flag to run our integrations tests. Could someone please provide more details?

https://docs.flutter.dev/testing/integration-tests/migration
https://docs.flutter.dev/testing/integration-tests
https://github.com/flutter/flutter/tree/master/packages/integration_test#integration_test