eGPU, is it worth installing it on this pc? and is it compatible?

I've paid 400 euros for a laptop i was convinced to be good, its an acer aspire ES1-711g-P12Y, it has 4GB ram, nvidia 820m 2gb and an intel pentium N3540 2.16 GHz, with turbo 2.66 GHz. Is it worth getting an eGPU (if yes, which), is it even compatible (any way to check)? any help is appreciated.

Thanks in advance