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If you entered the key in the key field during the edit phase you can go to the global settings>library settings>song title formatting>caption format> select keys and it will display the key as a sub-title under the song name. Then go to the global settings>library settings>tab order and put keys in the left column. This puts the keys tab at the top of the library with the songs/ recent/etc.

To include it in the body, if I understand you, you probably need to do that before making the pdf/jpg. Other than that, the only way I know of is to include it as part of the title when making the edit and [global settings>display settings>] always show title bar.