Allow specifying serial device path manually

[legnad]

Is it possible to add the option to manually specify the serial device path? Would this allow serial devices to be connected via ser2net?

Since I've run into USB stability problems in conjunction with running HA on a Synology NAS (VM), I've migrated the zigbee radio to an old Raspberry Pi running a ser2net docker container and set the connection port in ZHA config (see https://community.home-assistant.io/t/connecting-to-a-remote-zigbee-coordinator-with-zha-using-ser2net/561762)

With e.g. ZHA it is possible to do: