I want to use it like an external graphic cardAlmost certainly not, at least not integrating it
Laptops are rarely upgradeable..... and if you do not currently have a discreet GPU, there's no way to add one.
External enclosures are possible, but your laptop pre-dates Thunderbolt etc as options. So you'd need to 'hack' together a solution, which are never nice to look at and rarely work close to their full potential.