A build in audio transcript feature will be very useful!

Since OPENAI has powerful whisper model for transcript why not has a build in feature for transcription?
Currently users of OPANAI has to go to third party service providers to do audio file transcript which using the whisper model of OPENAI. GPTs are able to upload audio files but not able to do transcript which doesn’t make sense. It will be much easier it GPT have a build in feature for this.