Choice Filter choices representation in XForm json['children'] field

[lincmba]

Using this form with label choices for questions with choice filter, the resulting saved Xform json['children'] field contains

[
  {
    "children": [
      {
        "name": "texas",
        "label": "Texas"
      },
      {
        "name": "wdc",
        "label": "WDC"
      }
    ],
    "name": "state",
    "label": "state",
    "type": "select one"
  },
  {
    "itemset": "counties",
    "name": "county",
    "choice_filter": "${state}=cf",
    "label": "county",
    "type": "select one"
  },
  {
    "itemset": "cities",
    "name": "city",
    "choice_filter": "${county}=cf",
    "label": "city",
    "type": "select one"
  },
  {
    "control": {
      "bodyless": true
    },
    "children": [
      {
        "name": "instanceID",
        "bind": {
          "readonly": "true()",
          "calculate": "concat('uuid:', uuid())"
        },
        "type": "calculate"
      }
    ],
    "name": "meta",
    "type": "group"
  }
]```

The choices with choice filter do not explicitly appear here as children. This affects further processing as in exporting with labels.