Piper , and maybe speechd? Also look at speech note.
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Yup piper is a good option. install:
- extra/speech-dispatcher
- aur/piper-tts-bin
- aur/piper-voices-common
- aur/piper-voices-...-...
Then configure speech-dispatcher according to arch wiki and enjoy TTS via command line spd-say or in firefox directly (switch to reading mode for a website).
That plus KMouth would be exactly what OP wants. KMouth is an app you can paste text in and have speechd play it.
For setting up and selecting Piper TTS voices, use Pied. Then use KMouth by KDE to have an app to paste text in an make use of Piper TTS voices.
Now, while not exclusively text-to-speech, but my favourite programme for that would be Speech Note.