dream for the future; future aspiration
A set phrase used when talking about one's long-term goals or ideal future, often in contexts like career plans or personal ambitions.
My dream for the future is to become a doctor.
When I was a child, my dream for the future was to be an astronaut.
Compound of 将来 (future) + の (possessive particle) + 夢 (dream). A straightforward phrase with no unusual etymology.