I am using English and also need math notation.
thank you for contacting us and your question.
Currently, to answer your question, our technology doesn't allow to recognize Math mixed with Text.
Nevertheless, for use-cases such as yours, you could add a custom lexicon, in which you add the terms you want to recognize.
E.g. you can add expresssions such as 3+2 in a lexicon ; you then compile this lexicon and add it to your configuration file:
Note nevertheless there is one issue for the specific case of E=mc², as the square "²" cannot be recognized. The alternative (which I tried), consists in adding "E=mc2" in a custom lexicon. You will then be returned with E=mc2, which you can convert by yourself ad "E=mc²" if exporting.
Let me know if this helps.