I've known several. With some it was obvious. They all repress it, some getting married and having kids. Many of them don't last and leave their spouse and fall away from the troof.
My mom (still a JW) was telling me about some transgender person in their hall. This person was born physically female, and has not done any type of surgery or anything. Apparently this person "tried that lifestyle" but it was unfulfilling. So now her plan is to live out the rest of her days as a JW, repressed and unmarried. The new system will correct this "birth defect."