How do I change the missing value representation from a question mark?

I recently encountered confusion when my string data contained single question marks, which looked identical to KNIME’s default representation of missing values with a

?

In more user-friendly software like Alteryx, null/missing values are clearly identified with square brackets and a lighter font, like this:

They are thus immediately obvious, and the scope for confusion is removed. How do I configure KNIME to do something similar please?