Target of Maintained Effect...

[EQAditu]

You could just make a text element like: (Add some Location/Size/Font attributes)

<Text Name="Icon00Target" DynamicData="/GameData.Maintained.Spell_1.Target" />

It would display the first maintained icon's target as LocalText. The dynamic data goes all the way up to 30.

For the Target: prefix, you're probably better off making another Text element with just that. It'd probably be a waste to concatenate a string through scripting.