In modern laptops, the integrated graphics chip is in the processor, not on the motherboard.
In laptops which have discrete graphics, the chip is generally soldered to the motherboard in a BGA mount. They require expensive equipment and skilled technicians to change. Some larger and more serious gaming laptops had/have socketed graphics cards, but they are rather rare. Moreover, your BIOS is most likely configured to only accept what you currently have.
In short, no, it is not feasible to change your GPU.