An eSIM is a special SIM card attached to the smartphone’s processor. It is not a physical SIM card and cannot be inserted from outside. It is a technology through which telecom operators can communicate with others subject to their permission.
Oppo A97 is a slightly expensive budget phone that oppo released a few days ago. The phone comes with a dual SIM-supported system through which you can use two physical SIM cards. But you will not get the benefits of eSIM in this phone because this phone does not support eSIM technology.