Out of 7 dogs I have one that does put it in my hand and one learning. Robyn is that one that puts it in my hand. I never trained her specifically for that using treats. It was simple, she would bring the ball and drop it, I would tell her put it in my hand, I then ignored her until she did so(did not take long). It took like one time of ignoring her for her to figure it out. Most dogs are going to try to entice the owned to play and that can be by them nudging the hand with the ball. Timing that with "put in my hand" will work. Apollo will drop the ball and back up do I can get it, we are now working on him putting it in my lap(He gets close, if not my lap then right next to me). He should get it in the next week or so.
Misty- Samoyed Mix, Tannor- Golden Retriever CGC
Robyn- GSD CGC, TC, Midnite-GSD CGC,TC, Brennan-Golden Retriever CGC, Batman-Husky/Greyhound , Apollo-GSD