Скорее не аддон, а настройка...

[Foximys]

GameTooltip:HookScript("OnTooltipCleared", function(self) self.TukuiItemTooltip=nil end)
GameTooltip:HookScript("OnTooltipSetItem", function(self)
        local item, link = self:GetItem()
        local num = GetItemCount(link)
        local left = ""
        local right = ""
        
        if link ~= nil then
            left = "|cFFCA3C3CID|r "..link:match(":(%w+)")
        end
        
        if num > 1 then
            right = "|cFFCA3C3C".."Count".."|r "..num
        end
                
        self:AddLine(" ")
        self:AddDoubleLine(left, right)
        self.TukuiItemTooltip = 1
end)

local f = CreateFrame("Frame")
f:RegisterEvent("ADDON_LOADED")
f:SetScript("OnEvent", function(_, _, name)
    if name ~= "defUI" then return end
    f:UnregisterEvent("ADDON_LOADED")
    f:SetScript("OnEvent", nil)
    TukuiItemTooltip = TukuiItemTooltip or {count=true,id=true}
end) 

Попробуй.