Do we have e-sim from international providers

Several providers in different countries support eSim. You would need to contact the one you want to use specifically to get a plan with them and the option of the eSim.

Link-> Find wireless carriers that offer eSIM service - Apple Support

I want to insert my Nigerian sim

ajagbe wrote:

I want to insert my Nigerian sim

Go ahead. Link-> Remove or switch the SIM card in your iPhone - Apple Support