First, note they ask you to list in order of importance to you. Be careful how you list reflects which are more relevant to the college and your possible major.
The law institute might appear under ‘additional programs attended,’ or addl courses, check how it’s asked. Adcoms will see it there.
The point is to get your activities listed, even if the wording is tight, let them see these in this section. Then, as ski says, use Addl Info IF (only if) something needs a few more words. A few. They don’t need lengthy, they understand most of what kids do.