likert-survey-master – need a way to display average for each category

So, I came across likert-survey-master since none of the other existing plugins would let you have different categories of questions. I’m attempting to use it to implement a digital version of a psychological research instrument, which has choices of 1 to 5 and two different categories of questions, but then I need to compute averages for each category. It doesn’t seem like there’s currently a way to do that with likert-survey-master. Any suggestions? Is this just a matter of a simple tweak, or is this pretty complex?

https://wordpress.org/plugins/likert-survey-master/