Unfortunately not all phone's have eSim functionality built in which is a direct decision by the manufacturer for each model that's released.
If a phone hasn't been originally built with eSim hardware then it can't be added.
I wish you all the best. 😎
Daily Driver > Samsung Galaxy s²³ Ultra 512Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help. " This is the way. "