Quiz questions with chemical formulas that contain subscript characters

I am developing a course that teaches students how to write out chemical formulas. I need to have quiz questions that use fill-in-the-blank questions where the student writes out the chemical formula, which contains subscript characters. Please help me overcome these two problems:

1. When I create the fill-in-the-blank quiz question, I cannot find a way to put the subscript character in the form view. The shortcut key Ctrl + = only works in the slide view.  Unfortunately, for a fill-in-the-blank question, the form view is where I need to enter the possible correct answers. When I switch to the slide view, I don't see the possible correct answer entry fields anymore... instead, I just see what the student will see, which shows the text "type your text here" rather than the formula... so I cannot enter the subscript text in the slide view. What is the solution?

2. After publishing the file, it doesn't look like there is a way for the student to enter the subscript characters when answering the quiz. Not sure if this is a limitation of the player? The Ctrl + = shortcut key doesn't have any effect.

Please help! I can't be the only person who needs to create chemistry courses in this tool, can I?