[Rilgamon]

Perhaps you can take a look at OnHyperlinkEnter, OnHyperlinkLeave?

local function chatHoverIn(cf, link, text)
    local typ = string.match(link, "^(.-):")
--[[    print(typ,link)
    local tbl = { strsplit(":", link) }
    for k,v in pairs(tbl) do
        print(v)
    end
]]--
    if(typ == "item" or typ == "enchant" or typ == "spell" or typ == "quest" or typ == "currency") then
        GameTooltip:SetOwner(UIParent, "ANCHOR_CURSOR")
        GameTooltip:SetHyperlink(link)
        ShowUIPanel(GameTooltip)
    elseif(typ == "player") then
        local typ, name = string.match(link, "^(.-):(.*):(.*):")
        if(name) then
            GameTooltip:SetOwner(UIParent, "ANCHOR_CURSOR")
            GameTooltip:SetUnit(name)
            ShowUIPanel(GameTooltip)
        end     
    end
end
local function chatHoverOut(cf, link, text)
    HideUIPanel(GameTooltip)
end
 
for i = 1, NUM_CHAT_WINDOWS do
    local cfn = format('ChatFrame%i',i)
    local cf = _G[cfn]
 
    cf:HookScript("OnHyperlinkEnter",chatHoverIn)
    cf:HookScript("OnHyperlinkLeave",chatHoverOut)
end