CSP with NextJs 14 and express

Hello, I am having a problem with CSP when using NExtjs with custom express server. I use app router and wanted to add CSP headers using helmet for express. As soon as I add the helmet middleware I see that CSP is blocking all my scripts and can't figure it out how to tackle this. Has someone such setup or any tips how do I work it out? All I can find online is for pages dir...