I think it’s a really nice thing to do. Again, if you’re adamant about it, absolutely go for it. Tbh I feel you. Went into high school some 2-3 years ahead, did a few math competitions, but feel very little passion for it. I’m more of a science person. You’re probably not going to have this as your “main event”, but just wanted to give you my two cents. Mention it briefly but don’t emphasize it. If you emphasize it, sure, they’ll see your thoughtfulness, but they’ll also see you as someone with a passion for math.