Laptops generally have extremely limited upgrade options, typically you can upgrade the RAM and/or the HDD/SSD. The rest of the components tend to be soldered directly to the system board and can not be replaced.
Some Machines include a thunderbolt port which allows you to use an external GPU, however, Thunderbolt typically only delivers a total of 4 PCIe datalanes when most single GPU's benefit from 16. As such external GPU's are always severely constrained for bandwidth when using thunderbolt connections.
The service tag is what you go by to see the system specifications (a normal procedure for Dell). You hid it in the picture. Without it there is no way to know for certain exactly what is in that laptop
it doesn't matter what's in it, you can't upgrade it. you upgrade a laptop in that case by buying another one, but as stated, even the most powerful laptop card is a poor performer next to even an average pc card, and they love to overheat.