I need high quality speech so generated to float32 based
.wav or lossless Flac. I prefer online services but even when looking for an app, I only found English ones.
Not plateform resctricted as it can be any beside Apple products.
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You don't need 32-bit wav or flac for this, as the voice generated won't be of higher quality than a 128bit mp3/aac.
macOS can read 'text to speech' natively & optionally save to a file in iTunes/Music.
To set this up in a key-commandable form...
image saved from Mojave, newer OSes will look slightly different, but have the same functionality.
This will then read & save any selected text, system-wide, in whatever language you currently have selected & have the voices enabled for - System Prefs > Accessibility > Speech > System Voice: > Customise.