I need to create an Expert Advisor trading robot to close all orders on chart when price touches the center line of existing indicator "target-bands-indicator.mq4"

I will have orders open on multiple different chart assets so the EA must only close orders for the chart asset the EA is attached to

The EA will close orders immediately upon price touching the center line of "target-bands-indicator.mq4"  Do not wait until bar close to execute EA

Adjustable inputs required: Halflength = number