Find out how to change the display of metadata and configure the XML export options in Final Cut Pro.
A great short video tutorial from Classic Cycling showing the use and export of metadata in FCP. (A busy guy looking at his inboxes!)
If you want to have a custom display of metadata in the inspector, then that is quite easy by building a custom preset that includes the fields you need to see.
There is a lot more to FCP's metadata, take a look at Apple's instructions on Metadata in the FCP 10.5.1 help document and also don't forget Philip Hodgett's & Greg Clarke's now legendary XML explainer article.