Op here. I posted a video where I walk through how I auto-generate audio overviews for my newsletter. I cover generating a script (in my case from a markdown post), selecting voices, defining the hosts and their audio profiles, setting the scene, and finally generating the actual audio.
Happy to answer any questions that folks might have.
How I generate podcast-style audio overviews [video] · HackerTrans
Happy to answer any questions that folks might have.