Insecure Binary protection IOS Pentest Report

Thirdparty pentest company reported their findings in our IOS app. In the report explanation for this vulnerability is

Apple provides default encryption for applications; however, the encryption could easily be bypassed by using publicly available tools such as Clutch. This was verified by performing static analysis that shows that the application code has not been encrypted, using a strong encryption mechanism, which makes it easy for an attacker to reverse engineer the application and to explore and modify its functionality.

For the remediation they suggested

The recommendation is to use a custom encryption solution for the iOS application. Is it possibile to build IOS app with custom encrytpiton solution? Is that something that is a feature when compiling IOS app?

Is there a way to use custom "encryption" for IOS app?