Modbus new style configuration hub with devices in separate files

Hello
I’m trying to add several energy meters connected to Modbus - TCP hub.
Using new style, if all configuration is in one file things are OK.
How to separate config files for each device for better management?
In addition each device must be added to different area, but this will be later.
If I try to repeat hub configuration in each device file I get error about duplicate host/port.
Tried to include files after sensors: in hub file, also not working. They are just not included.

Any help here will be appreciated. Thanks in advance!