Logprobs in realtime conversation?

I was looking to experiment with logprobs as a tool for refining conversation transcripts, and was hoping to retrieve them from conversation items in the input audio transcription. However, the session.update requests for conversation don’t seem to include them.

Is there a way to get back the logprobs? Since the transcripts apparently come from the same v1/audio/transcriptions endpoint, which does support returning them, I’d think it’d be possible to retrieve them.