Do remember that conditional highlighting is known to work for a quantified field. For example, there is data that involves numbers, this can be highlighted. It can also highlight summary formulas. Based on that, it is evident that conditional highlighting can be used in order to highlight the answers that are displayed by the customers externally.
This means that the answers are public and can be accessed by other people who are also checking the portal. The various data categories can also be highlighted by conditional highlighting especially since they would lump all of the similar questions and answers together.