I was using my Zone Sticker and placing the shadow on Zone III for starters.
Then I looked at where the meter reading of your bright path would fall. You want it bright in your print...
So you will "overexpose" the path. After the meter tells you what to do, you "open up" a few stops. Meter is V, Open up 1, 2 ,3 stops.
So you go from
open three stops....
So if you use 1/500 at f/8 the shadow you place on Zone III would cause the highlight to fall on Zone VIII.
Now you say you want the highlight to be on Zone VII. You could compress by developing N-1.