just:in comes with a a pre made QuickTime Metadata XML Template. Like the other XML Templates it's located at /Library/Application Support/ToolsOnAir/Just In.

ToolsOnAir User Guide Central > 3. QuickTime Metadata (just:in v3.0) > QuickTime XML Template.png

This is how the Inspector looks when you select the QuickTime Metadata Set.

ToolsOnAir User Guide Central > 3. QuickTime Metadata (just:in v3.0) > Screen Shot 2016-11-15 at 10.01.47.png

QuickTime Metadata Labels

Album: com.apple.quicktime.album
Artist: com.apple.quicktime.artist
Author: com.apple.quicktime.author
Comment: com.apple.quicktime.comment
Copyright: com.apple.quicktime.copyright
Description: com.apple.quicktime.description
Director: com.apple.quicktime.director
Title: com.apple.quicktime.displayname
Information: com.apple.quicktime.information
Keywords: com.apple.quicktime.keywords
Producer: com.apple.quicktime.producer
Software: com.apple.quicktime.software
Year: com.apple.quicktime.year