Look messages are generated server side, but the message for look is mode 20, so you can listen for mode 20 textmessages and then just get the position from the tile under your cursor.

onTextMessage(function(mode, text)
    if mode == 20 and text:find("You see") then
        if not modules.game_interface.gameMapPanel.mousePos then return end
        local tile = modules.game_interface.gameMapPanel:getTile(modules.game_interface.gameMapPanel.mousePos)
        if tile then
            local loc = tile:getPosition()
            error("Position: " .. loc.x.. ", "..loc.y..", "..loc.z) -- remove this if you don't want it showing on bot
            if not modules.game_textmessage then return end
            modules.game_textmessage.displayMessage(16, "position: " .. loc.x.. ", "..loc.y..", "..loc.z)
        end
    end
end)