Modbus - write register directly without need of service

Hi, I have spend last few days searching forum and documentation to find out how to create writable variable in Modbus integration. Based on what I have found it is not possible. Could we please add this option, it would be much more simple to have option to create writable variable next to the switches and sensors. To set the value you would not need to use the service, you would just change the value in GUI.

That’s a template number. All doable right now, and still uses the service.

Could you please write me an example. BTW thanks a lot for response!