Additional Information section in Common APP?

My daughter’s key school activity is debate. She used it as a springboard for her personal essay to discuss a particular experience she had while a debater. The 150-word extracurricular activity space in many of the common app colleges doesn’t really get to the benefits she has derived as a thinker/speaker because of debate. So we would like to use the additional information section to describe how debate has really sharpened her academic skills as a researcher/writer, etc. Would admissions officers see this as overkill, or is this a legit use of the Additional Info section? We have about 400 words of text (out of 650).