Is there way to reduce operation amount of Slack Event module?

Hi all!

I am using the slack ‘New Event’ module for slack’s reactions, but the number of operations increases because it picks up reactions of the whole slack, and the billing increases.
My boss told me, ‘If you can’t reduce the number of operations, we have to stop using Make.’
I would like to be able to pick up only the reactions of a specific channel in slack, or only the reactions of a specific stamp, but is there any way to do this?