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You cannot change the 3d objects so it might be hard to achieve your goal by help of an addon.
You could spawn an object, a texture 'arrow' maybe, next to the unit if you get the x and y and z coordinates of the unit.
But it would consume a lot of memory I guess to create/destroy the textures.
I'd say its not possible then :-(
Otherwise I'd love an addon to show signs above group members ;-)
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