Yes, the store admin can add their own carrier and assign the order to them for delivery. However, in order to achieve that, you need to enable the carrier functionality. You will get the carrier functionality if you have chosen Enterprise Plan and above for your e-commerce store. Adding carriers in the store is very easy. To do so, follow the steps mentioned below:
Once the carrier is added, the order can be assigned to the carrier and the carrier can deliver the order. For availing more information about the carrier functionality, visit the helpcenter - https://help.storehippo.com/topic/carrier-management