It is certainly possible. Practical? not so much. Brad can program in every possible variation of salt additions, and many other salts which have been suggested in the past few months, but it ends up really benefiting a very small amount of users. I don't see any other water adjustments spreadsheets offering that option and for a very good reason.
The vast majority of food grade Calcium chloride sold for use is in dihydrate form. Unless you are in a very well controlled environment when using anhydrous Calcium chloride and severely limit exposure of the contents, I'm willing to bet yours is no longer anhydrous.
