Certainly a JW has no concept of spirituality. By putting a male led organisation between the Great Crowd and Jesus it is impossible to truly know what spirituality is. Jesus said the head of man is the ... Christ. For some reason the head of a JW is the F&D slave. The mediator between God and man is ... Christ, for some reason for the average jDub it is humans, the anointed.
I really think that whilst someone is a JW there is not real spirituality. They may have started with it but it gets sidelined. Now when I listen to a JW talking i am surprised how much is about the WTS, the Org, the brothers. It is rarely about a relationship with Jesus.
Even the word Jehovah prevents a JW having a true relationship with God. Jesus said his followers would become close enough to call him Abba Father, never did Jesus say Jehovah God, so much more formal. Like living in a naughty boys home referring to the big scary principle, not in a loving family.