There's bundle path and entrypoint function name, but no entrypoint file name. So there's no easy way to point to another dart file in lib/.

https://github.com/flutter/engine/blob/21195a1aefcd79ceb1e1436a3649cd79448be619/shell/platform/android/io/flutter/embedding/engine/dart/DartExecutor.java#L124

is just null here.