Hi, I made Captionify. It’s an app that can convert audio and video files into subtitle, plain text, or back to video but with the subtitle burned in it.
Here’s the app store link Captionify - Speech|Subtitle on the Mac App Store
It’s in the early stage with very basic functionality right now. You can email me for promo code or TestFlight at hello@damywise.com
More info at https://captionify.app/
Here’s a demo