No. Your system board won't have a socket intended for removeable GPU. The systems with the discrete GPU ship with a system board that has the GPU soldered in place. So, to modify your system to have the discrete GPU you would have to buy a system board that includes the discrete GPU. You would also need to buy a new heatsink that accommodates the discrete GPU.
if i buy NVIDIA GeForce MX550, is it possible to install GPU on my inspiron 14 7420 2-in-1? Last time i bought my brand new inspiron 14 7420 2-in-1 without NVIDIA GeForce MX550
i like to play games on my inspiron 14 7420 2-in-1