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": [] } ] } ]
Then add a channel filter
And you have:
And you can see if you open the tree the different regions and countries:
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