Let me see if I understand you correctly. You had a Samsung phone and an iPhone on the same Verizon account. You have lost your Samsung phone. You would like to know whether you can transfer the Samsung phone number to your iPhone with use of an eSIM.
——-
If the above assumption is correct, then the answer is YES. Your iPhone XR is capable of holding one Physical SIM and one eSIM and each SIM can be associated with its own phone number. This means that if your current phone number on your iPhone XR is associated to a physical SIM, then you can call Verizon and have them activate your old Samsung phone number with use on an eSIM. Once you complete this action with Verizon, then you will have both phone numbers active on your iPhone XR.
Axel F.