missing-root I believe there are TTS engines available for several systems, one of them is Android.
They also have other apps as well. (Vouce to text, etc)
I am not sure how reliable these pre-build apps are, so use them with caution, if at all.
And indeed, it requires a little bit of trial and error to see which TTS is the best, for Dutch, a "newsreader voice" coqui sounds realistic, the other ones are a little flawed.
For English, I find the Kristin medium voice work very well.
Some others are inaudible.