Sentence examples for is also to from inspiring English sources

"is also to" is a correct and usable phrase in written English.
It is commonly used when discussing an additional action or purpose in relation to something else that is already mentioned. Example: "Not only is exercise important for physical health, but it is also to improve mental well-being." In this sentence, the phrase "is also to" is used to emphasize that in addition to the primary purpose of exercise (improving physical health), it also has the secondary purpose of improving mental well-being.