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Pixel 4 just got released. Don't you think it's too early to check for mods? It's not like the GCam mod, which apparently gets leaked by Google itself.
Plus, if you are looking for the transcribe feature (sound to text) in the recorder, then it won't work since Pixel 4 has a dedicated hardware for it, the neural engine, to do that. It is not an over-the-air real-time transcription service, so even having a mod may not work. But you could still search Google for any clever developer who found a workaround for it.