In a resume, I want to tag various things done as "extraneous to what the job description specified". These things were achieved on top of regular tasks, so the candidate went above and beyond what was expected and contributed those too.
The goal is both to justify/explain the presence of those accomplishments despite them being outside the stated professional role and to prop up the candidate for surpassing expectations.
"Extracurricular" came to mind, but has a strong 'school' connotation that I'd like to avoid.
I was tempted to invent something like "Ex-Role"? Or maybe just "extraneous", but that seems entirely too dismissive.