Attach ID to audio data?

[FezVrasta]

Hi, I need to let my users insert text in a page containing several text fields.

They should be able to dictate inside any of them, and switch between them by focusing a different text field.

Is there any way to attach some information to the audio data sent to the AWS Transcribe service in order to know where to put the transcriptions when it's received?

What I'm trying to avoid is that a user switches between different text fields while he's talking and I end up appending the transcription to the current text field rather than the one that was active when the user spoke that sentence.

What's the best approach to handle this case?