Hello. Here’s a link that might be helpful. After installation I noticed irregularities in my granite and the specialist came in custom mixed in epoxy type liquid to smooth out rough areas and missing chips. Perhaps something like that could be accomplished — but being a vertical surface - filling smoothly may be challenging.
Here's a video that might help. Wishing you the best.
This breaks the repair process down https://www.hunker.com/13416777/how-to-repair-cracks-in-a-granite-countertop
Here is what I found
Hi Kimm, hope this one helps you
You will need nail polish remover to clean the granite surface, straight razor blades, thick super glue (gel), and if you have a darker Granite Countertop you might want to have dark Sharpie marker. Start cleaning your chipped area with nail polish remover. Let the Granite air dry. Tape off the area surrounding the chip and apply just enough glue to fill the chip and rise just slightly above the surface of the stone. Filling the glue up to within flush of the surface of the tape should be sufficient. Once the super glue has completely dried and the tape removed, use a straight razor blade to remove the excess Super glue by “fanning” the excess material away. Wait and allow the glue to cure before cutting with the razor. The time it takes for the glue to cure depends on how deep the chip was, the humidity in the home, etc.(This next step only applies if you have darker Granite) Once desired results are achieved, you may wish to use a colored permanent marker such as a black Sharpie to color the super glue. A Sharpie is permanent and dries quickly. For lighter colored stones, this may not be necessary.
You may need to add "L" brackets underneath to support that section once you've glued it.
I found a stone repair kit today that comes with about 8 colors of epoxy. It’s $33 on line.
Of course, you have to stabilize the water damage that’s occurred under this area, from below first.
Hi Kimm, here's a lovely video that will show you how to repair that crack - https://www.youtube.com/watch?v=22d79exP2iw
go To homedepot and get a granit adhesive and glue it