Text to speech - ultimate could have the ability to play an audio of the printed text. There is an OpenAI API that does a good job, and since it costs money, it would make sense to include it with Ultimate only: https://platform.openai.com/docs/guides/text-to-speech
User could have the option to choose the voice and ability to download the recording as mp3/aac.
There are 2 models, regular TTS (costs $15/million characters) and TTS-HD ($30/million characters). I think the regular is pretty sufficient.