Configuring content security policy

[KaliRajan G]

Jenkins doesn’t allow the CSS and Font Styles (Configuring Content Security Policy) as per Jenkins security policy by default. We want to enable that the CSS and Font styles. So, we used the below groovy command to enable the CSS and Font Styles.
Groovy command:
System.setProperty("hudson.model.DirectoryBrowserSupport.CSP", "")
Even also font styles were not applied. How can i enable the font styles to Jenkins to view the html file with CSS and Font Styles applied? Is there any help documentation link?