Chat with Verizon. they can move your physical sim to the esim then you can use any GSM sim in the physical slot. I believe you cannot have two CDMA providers.
I had this on my XSMax and now the 11 Pro Max.
I use the esim with Verizon and have a cheap pay as you go on AT&T's network in the physical.
I also buy prepaid as i travel overseas.