I've had numerous job interviews for jobs in 100% Japanese work environments, and I've always included the fact that I have passed Level 2 on my 履歴書.
Two points:
1. So far, I haven't interviewed with a single employer who had ever even heard of the JLPT.
2. They wouldn't give it much weight anyway, since they go more by what proficiency you can demonstrate in the course of the interview than by what some piece of paper purports you to be capable of.