@minecraft/creator-tools/data/forms/block/block_specifier.form.json

Minecraft Creator Tools command line and libraries.

{
  "title": "Block Specifier",
  "description": "Specifies a particular block. Can be a string block name or a JSON object",
  "fields": [
    {
      "id": "name",
      "title": "name",
      "description": "Name of the block",
      "dataType": 2
    },
    {
      "id": "states",
      "title": "states",
      "description": "Contains members named after each state, with boolean, integer, or string values.",
      "dataType": 24
    }
  ]
}