로서는

as, for (from the standpoint or in the capacity of)

로서 Role or capacity (“as”) + 는 Topic marker
preposition Rare #30,601
as, for (from the standpoint or in the capacity of) Attached to a noun; often used when talking about someone’s role, perspective, or circumstances.
KO: 부모로서는 걱정돼요.
EN: As a parent, I’m worried.

엄마 로서는 별로 였거든요

She wasn't really that great as a mother.

— 그을린 사랑 (2010)

경찰의 아내 로서는 잘 안 맞아

She’s not really suited to being a police officer’s wife.

— 폴링 다운 (1993)