If I understand you request correctly; we have no way to create a UI element that can escape the confines of the ESO User Interface frame (the client application).
Currently, ZOS does not allow for elements from within the game screen to become Pop-Out applications that can reside on the user desktop.
The In-game chat system is using LUA scripting and is confined with in the client stream, so would not be accessible via the OS or other applications.
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