How to allow user to input mathematical symbols in Fill in the Blanks quizzes?

I found the Fill in the Blanks quiz type of H5P really great. However now I have a use case that seems to go beyond the standard functionality.

I'm interested in making a quiz where correct answers can include mathematical symbols. Although it's possible to put mathematical symbols into the pre-defined correct answers by using the right unicode characters, this doesn't solve the problem yet of letting the quiztaker easily fill in the correct mathematical symbols.

Websites that expect mathematical symbol inputs from users often solve this through displaying a menu where the user can select mathematical input symbols for input by clicking on them.

Does any plugin exist, either directly H5P-based or independent from H5P, that would allow you to integrate such a mathematical input symbol selection menu into a H5P Fill in the Blanks quiz?