Using Mirror Voice functionality via API

Hi Team,

I am looking to begin using your API service, but I could not find documentation for the "Mirror Voice" function available in the AI Studio.

Could you please provide guidance on how to use this via the API? Specifically, I am creating a workflow where I need to:

Upload a recorded voice to HeyGen via API.
Have the system transcribe that audio.
Have HeGen Integrate it with an avatar using a synthetic voice that references the original recording's intonation and rhythm. (In other words, the Mirror Voice function via API)

Thank you for your help. J