At least for chinese there are off-the-shelf word segmenters you can use like jieba[0]- I used it in gptlingo and it Just Works(TM).

The "show pronounciations" setting just turns on pinyin above characters - what I want is to type pinyin and enter chinese characters. Actually showing the pinyin above characters is quite distracting!

[0]: https://pypi.org/project/jieba/