Ace-I don't know that answer, if there is one. I use the avatar move to get the distance exact but as for the break it's definitely a feel thing. I know of no exact method of computing that break but what I can help you with is guesstimating where to start.
You need to recognize there are different speeds for those dots. The faster they go the sharper the break. I break it down to three speeds-fast, no so fast and slow. For fast moving dots, in reverse view, I will aim 1 whole grid line away, on the side of the break at the cup and see what happens. Using that 1st grid line will give you a reference point to work from. On not so fast moving dots maybe you start with an aim only 1/2 of a grid square and on slow maybe 1/4. That's where you develop the "feel" thing. You see enough putts and after a while you just know when it doesn't look right. If you consistently find yourself breaking early and missing low either speed up the putt (speed overcomes break) or increase your aim.
Some players like to leave the aim alone and miss on purpose to steer the putt. This works pretty good-I use it sometimes-but I caution you, developing a habit like that now is hard to break later when you really need to be accurate, like at the master level.
Lastly, when you are looking at a break remember that if you miss on the high side or ding it you have a chance for the putt to go in. If you miss on the lower side forget it-it will never go in.
Set up a practice round at BPB with the different speeds. The first three holes there will get you about 20+ putts on varying lies and then you can start over. The key is doing it a lot. GL