What would an alternative to JavaScript's Reduce() be in Power Automate?

[emfuentes27]

I'm fetching list items from a very simple SharePoint List using Get Items. 

List:

I can pull the data without any issues, and I get the JSON.

The output is:

[
  {
    "State": "NY",
    "Person": "James"
  },
  {
    "State": "NY",
    "Person": "Kurt"
  },
  {
    "State": "SC",
    "Person": "Jose"
  },
  {
    "State": "SC",
    "Person": "John"
  },
  {
    "State": "MD",
    "Person": "Paul"
  },
  {
    "State": "FL",
    "Person": "Pedro"
  },
  {
    "State": "WA",
    "Person": "Jeane"
  }
]

I tried to use Union() to find duplicates with a Compose using union(body('Get_Data'),body('Get_Data')), but the output is exactly the same. How can I achieve the desired JSON grouping items from the same State as shown below using Power Automate?

{
	"NY": [{
		"State": "NY",
		"Person": "James"
	}, {
		"State": "NY",
		"Person": "Kurt"
	}],
	"SC": [{
		"State": "SC",
		"Person": "Jose"
	}, {
		"State": "SC",
		"Person": "John"
	}],
	"MD": [{
		"State": "MD",
		"Person": "Paul"
	}],
	"FL": [{
		"State": "FL",
		"Person": "Pedro"
	}],
	"WA": [{
		"State": "WA",
		"Person": "Jeane"
	}]
}

Thanks in advance.

[VictorIvanidze]

Hi @emfuentes27 , start here.