I have interviewed for two different ICU's over my RN career. During both interviews I expressed my determination to become a CRNA, but what I really think got me the jobs was my extreme interest in learning and hard work. I personally would recommend letting them know that you are interested in CRNA school. A couple factors to weight:
IF you do let them know, that could be a slight factor in you getting the position.
But if you dont tell your manager, what happens when your suprise him/her by asking for a letter of recommendation in 8 months...Most schools
require you to have a LOR from your current manager. If they want to keep you, they'll write you need more experience, its happend to many people.
Maybe you could ask your manager how he/she feels about furthering ones education. If she promotes it I would be honest with her with your dreams/goals.
Just something to think about!