The USB-C connection on the back of the KVD21 (Home Internet), can there be an external antenna attached?

I have seen other cellular routers that do have external antenna connections and a robust feature set, but they are more expensive and T-Mobile would probably not allow the connection to their network. The current "solution" is about control on various levels and limitations on support. It would be nice if they did offer a router with the external antenna connections for subscribers in challenged locations where service could be improved.