@Eeshen
Hi, this code can't help in any manner with plugins, however, if you use a skin, inserting it in its skindefinition.xml file will display this extended version of the target's target vital frame. The panel code has to be accompanied with an updated picture of the target's target.
This work is already processed and available in these Lotro user interface skins :
Some extended panels within the default lotro blue theme :
https://www.lotrointerface.com/downloads/info598
A vast collection of themes :
https://www.lotrointerface.com/downloads/info581
A blue glassy theme :
https://www.lotrointerface.com/downloads/info651