How to create a DFF on the phone details page

Summary:

To check the feasibility to add a DFF on the phone details page.

Content (please ensure you mask any confidential information):

I want to add a DFF on the phone details page.

Please assist in ensuring under which code we can create DFF for Phone Details.

Version (include the version you are using, if applicable):

25B

Code Snippet (add any code snippets that support your topic, if applicable):