Insert Chemical or Mathematical Symbols

Dear Memrise,
Can you please allow people to insert Chemical or Mathematical symbols when making flashcards, because it would be really handy with trying to make sense of what you write on the flash cards.
Examples of symbols that I mean are:
SO₃²⁻, Δ, °, σ, Σ
If you were unable to see the symbols I had listed above, I am going to state the name of them instead. i.e Power to 10, ions, delta sign, degree sign, arrow (the reaction sign in chemistry), pi, sigma, uppercase sigma etc.
It would be amazing if you could offer these features memrise, because it would mean that people can not only learn a language but a scientific subject as well :slightly_smiling_face: