studying foreign languages and nemeth math equations

Braille on Apple Products

I see that apple iOS 13.1 supports lots and lots of braille languages when using a braille display. And it also supports showing math equations in nemeth braille. Where in iOS or on the web can I get example equations so I can see them in nemeth braille? Is it possible to write nemeth math in the notes app in iOS? if so, how, and also then get nemeth braille output? iOS puts all other platforms to shame with the number of braille languages that it supports!