Change chain volume value conditionally

I want a fader to change the chain volume value, if the chain selector is on the active range for the edit zone.
I have the reaction with the fader as listener
I started the loop for each chain, set up the loop to go for the speciffic instrument rack
I add the action which is device chain-set volume value
I set up the action to go through each iteration item
but this way it controll all chains valume value at the same time…
so I added a condition: and this is the problem, I think the best condition would be that the fader change chain volume value only if the chain selector value match the chain range on zone edit, but I dont see any information regarding zone edit for chains… or anything… please…