Currently, there is no algorythm in Canvas to process case sensitivity automatically in a "fill in the blank" or "short answer" assessment. However, students do have access to the Rich Content Editor in a Quiz response; and, with that, they can use upper-case, lower-case, Super-scriptedn and Sub-scriptedn variables. One suggestion would be to offer questions that require specific case-sensitivity using the Essay Question feature in Canvas and grade those responses manually rather than having Canvas grade them automatically.
The students would have the ability, for example, to write a chemical formula:
Write an Algebraic response