eSim on iPhone X

An eSIM itself is part of the logic board. It is rewritable hardware and is either included in the manufacturing if a device or it is not.

The first iPhones to include an eSIM were the successors to the iPhone X, namely the iPhone XS and XR iPhones.

iPhone X was discontinued 3 years ago.

Esim is based on hardware, not software alone.

No, there is no eSIM in an iPhone X.