How to reference an array field from an enum field?

[easyjoh]

Prerequisites

• I have read the documentation

What theme are you using?

material-ui

What is your question?

I am trying to collect an array of string items in one field.
In another field I need to point which of the items in the array shall be the default, thus, I want a dropdown with the items collected in field1.

I am trying something like this.

how do I get et working?

"secondlines": {
      "$id": "#/properties/secondlines",
      "type": "array",
      "format": "table",
      "uniqueItems": true,
      "title": "Secondlines",
      "default": [
        "Some string"
      ],
      "items": {
        "$id": "#/properties/secondlines/items",
        "type": "string"
      }
    },
    "defaultsecondline": {
      "$id": "#/properties/defaultsecondline",
      "type": "string",
      "title": "Default secondline"
      },
      "enum": [
        {
          "$data": "/secondlines"
        }
      ]
    }