As long as you use your eSIM according to what your plan includes (in terms of data, voice, and text) you will not have roaming fees. If you use your eSIM prepaid plan out of what your plan include, you risk roaming fees. Since your plan is prepaid (money paid upfront) and not postpaid (paid after), you have "no overdraft" and any roaming fees might end-up deactivating and expiring your prepaid plan almost immediately. Some providers will provide securities that will simply prevent roaming by not allowing you to connect to networks excluded of your plan.