[Feature request] transcribe/translate local audio

[mzltest]

Thank you for wanting to share an idea! But before starting, ensure to check if this feature request respects the following requirements:

• It is written in English (I can translate what you say, but issues written in English are easier to read for the other users).
• There is not already a similar feature request among the open or closed issues.

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Since everything is locally computed and batteries included, An option for transcribe/translate local audio file may be feasible and cost-effective(think whisper apis+llm translate apis pricing).

[mzltest]

• And if possible , export timed captions (might involve a VAD for segmenting)