Yes, you can have two eSIMs on an iPhone 14. iPhone 13 models and later (including iPhone 14) support Dual SIM with two eSIMs, in addition to supporting a physical SIM and an eSIM combination.
All iPhone models that support eSIM can store multiple eSIMs, but the ability to use two active eSIMs simultaneously (Dual eSIM) is specifically available on iPhone 13 and later models. iPhone models without a physical SIM tray support two active eSIMs.