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Hi,
You cannot do it directly from Transcribe, you would need to use AWS Elemental MediaConvert (Caption Selector, external file) to do that : https://docs.aws.amazon.com/mediaconvert/latest/ug/set-up-captions-in-outputs.html
Please refer to this document for a list of supported caption workflows for sidecar captions support : https://docs.aws.amazon.com/mediaconvert/latest/ug/sidecar-captions-support-tables-by-container-type.html. You can see that the supported caption output formats are all text-based (IMSC, WebVTT, TTML for example), not embedded like EIA-608.
You can automate this workflow using EventBridge to trigger the MediaConvert job as soon as the Transcribe job is finished : https://aws.amazon.com/eventbridge/features/
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