How to merge output of child step functions into parent step function output

Hi Team, AWS has given the following link https://aws.amazon.com/blogs/compute/orchestrating-aws-glue-crawlers-using-aws-step-functions/ to Orchestrate Glue Crawlers using Map state. I used this example, and it works great. But I'm, not able to read output of each crawler execution from the parent step function. The SUCCESS state of parent step function only shows 1 crawler execution result. Each child crawler individually shows its own execution result. But how do we get the execution result of each child crawler from the parent step function? What changes do we need to make to the above example? I have 12 child crawlers which run in parallel using the MAP state. What settings need to change? Please help.