@jcrvch333 To answer your first question, you won’t be able to submit extra documents like this with your application. Your admission will be decided based on the information/documents that the application asks you to provide.
It would be preferable to have at least one recommendation letter from a teacher who has seen you in a classroom setting, as it is important for the admissions office to have the perspective of somebody who knows you in an academic setting. However, you may include another letter from somebody you know outside of the classroom, like a mentor or extracurricular supervisor or something similar.