Idk if it's the best but they have Transcribro in the Accrescent app store.
what's the best free and open source text to speech engine app that works great on nostr:nprofile1qqs9g69ua6m5ec6ukstnmnyewj7a4j0gjjn5hu75f7w23d64gczunmgpz4mhxue69uhhyetvv9ujumt0wd68ytnsw43q4gnztg?
Idk if it's the best but they have Transcribro in the Accrescent app store.
Oh this might be the inverse of what you need