Hi Shri,
Have you checked this page: https://docs.mendix.com/howto/security/using-mobile-capabilities/csp/
There is some information about using a strict CSP
Here is a detailed explanation of how you can configure CSP in Mendix
Content Security Policy | Mendix Documentation
And here you have detailed information what the CSP is and how to use it
Content Security Policy Level 2 (w3.org)