Nameplate tracking SPELL_CAST_START destination unit

[Ketho]

Recently there was this question which I was wondering for years.

The SPELL_CAST_START CLEU event doesn't include a destination.
http://wow.gamepedia.com/COMBAT_LOG_EVENT

But now with the Legion nameplate unit ids we can kind of still get that information.

With the added footnote that it won't work for most cases, like

• mouseover casting
• @unit macros
• AoE casts
• most boss abilities
• when the nameplates are toggled off

Rough example where unit(s) are casting a spell and they are "targeting" the player; by comparing nameplateNtarget

local np = C_NamePlate
local f = CreateFrame("Frame")
 
function f:OnEvent(event, timestamp, subevent, _, sourceGUID, sourceName, _, _, destGUID, destName, _, _, spellID, spellName)
    if subevent == "SPELL_CAST_START" then
        for _, v in pairs(np.GetNamePlates()) do
            if np.GetNamePlateForUnit(v.namePlateUnitToken.."target") == np.GetNamePlateForUnit("player") then
                print(format("%s is casting %s on me", sourceName, GetSpellLink(spellID)))
            end
        end
    end
end
 
f:RegisterEvent("COMBAT_LOG_EVENT_UNFILTERED")
f:SetScript("OnEvent", f.OnEvent)

So I'm wondering if this is already sort of implemented in WeakAuras or Boss Mods? It would probably be handy if not.