Where should you explain a bad GPA due to truly extenuating circumstances?

I’m at a four-year. I’ve already decided to transfer and I have compelling reasons to do so, which are completely irrelevant to this thread. If I wanted advice on whether it’s a good idea to transfer, I would make a thread about that. This thread is about a couple of specific questions, which I asked in the first post and again just above: If the school does not provide a place to mention exceptional circumstances, where is the most appropriate place to include them in the application? Or should an applicant never elaborate unless given the opportunity to do so?