Wago PLC with modbus

Hi, I think I found a problem in this topic:

There is a chapter: Set coil to true on any command

(inspired by [Modbus] Coil reset only after item update to ON (OFF excepted) #4745 )
Reads from index 0, writes to index 1. All writes (no matter what command) are converted to 1.
Number NumberItem “Number [%.1f]” {modbus=“<[slave1:0],>[slave1:1:transformation=ON]”}

I just need to achive this behavior. How to add "transformation=ON". Can you tell me if I can do it in Paper UI or do I have to move everything to files? I will do it anyway, but now I just want to know if this works for me.