Illinois — this is already required of you.
Illinois requires character education by statute. 105 ILCS 5/27-12: every public school teacher shall teach respect, responsibility, fairness, caring, trustworthiness and citizenship. 405 ILCS 49/15 requires every district to hold a policy incorporating social and emotional development. 23 Illinois Administrative Code 235 sets the SEL standards themselves.
Four of the six traits the statute names are categories our students write on the wall themselves in the first week. The question is not whether you need this. It is what you are using, and whether you can show it happened.