modulus 2 points 3y ago
Unfortunately the answer to this is, it depends. There are several factors, but particularly the support of the screen reader for that code page, and the braille table in use.
With NVDA 2019.2 and the German 8-dot braille table it comes with. those characters are shown as follows:
* ĝ: dots 1, 2, 4, 5, 6, 8.
* ŭ: dots 3, 4, 6, 8.
* ŝ: dots 2, 3, 4, 6, 8.
The g and s with the diacritic have a bit of a resemblance to the base characters. The u does not, (though it could be seen as a mirrored u with an extra dot).
But, for example, with Spanish 8-dot braille table those characters aren't available, and the braille display shows them as unicode code points: \x011d, \x016d, and \x015d. Not very intuitive.
Worth pointing out as well that there is an Esperanto braille table available, which of course has those characters in it.