Postman Flow - grouping results

Hi,

I’ve started using Postman Flow and I have a use case that is difficult to resolve by myself.
I have a sequence of requests. The first request returns a collection of objects. For each object from this collection, I make a second request. I want to collect grouped output from the second request with one date from the first request.

For example the first request returns:

{
  "list": [
    {
      "key1": "value1_1",
      "key2": "value1_2"
    },
    {
      "key1": "value2_1",
      "key2": "value2_2"
    }
  ]
}

The second request based on key2 value returns:

{
  "items": [
    {
      "number": 12312,
      "key": "value"
    },
    {
      "number": 12312,
      "key": "value"
    }
  ]
}

And the expected result is a table with columns: request1.key1, 'items` (all things from the second request).