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I want to display a country list with regions. To do so I create a tree view field that references the country tag box:

[
	{
		"fieldId": "country",
		"allowRecursion": false,
		"levels": [
			{
				"fieldId": "regions",
				"allowRecursion": true,
				"levels": []
			}
		]
	}
]

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Then add a channel filter

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And you have:

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And you can see if you open the tree the different regions and countries:

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