Metaburner is an Advanced Metadata Generator for Final Cut Pro.
You can access it via a Title in the Titles sidebar.
Metaburner gives you 25 text layers that you can populate with whatever metadata you want.
You can even stack multiple Metaburner Titles on top of each other for unlimited metadata fields!
To begin, simply drag your Final Cut Pro Project from the Browser into the Metaburner Title Inspector via a drop zone, and then Metaburner has full access to everything that's in the FCPXML.
There's also a Lua scripting environment built-in, so you can even "code" your own text for unlimited possibilities.
You can even share Lua variables between multiple Metaburner titles for some crazy cool workflows!