I want to change prefix payload when subscribe data from LOGO!, it's possible to change prefix payload before publish  using ladder diagram in LOGO! Soft Comfort? 

Message from LOGO!:

{"state"{"reported":{"var1"{"desc":"V-byte-0-2","value":[20]}}}}

Message I want:

{"mydata":{"var1"{"desc":"V-byte-0-2","value":[20]}}}