if its in osrs and it helps players learn the raid, support, although it may also help just you personally if you know that the range, mage, and melee are always in the same locations regardless of the layout (on alora).
I just use NPC indicators and mark them with their respective colors.. however I do think this would be a great addition.. As well, there's a plugin on osrs that show the hp % of each vanguard above them so it's easier to gauge whether or not they're all within 30% of one another. Would be a cool addition to this vanguard plugin as well.