document:
  nodes:
    - object: block
      type: unordered_list
      nodes:
        - object: block
          type: list_item
          data:
            checked: false
          nodes:
            - object: block
              type: unstyled
              nodes:
                - object: text
                  leaves:
                    - text: Hello
        - object: block
          type: list_item
          data:
            checked: true
          nodes:
            - object: block
              type: unstyled
              nodes:
                - object: text
                  leaves:
                    - text: World
            - object: block
              type: unordered_list
              nodes:
                - object: block
                  type: list_item
                  nodes:
                    - object: block
                      type: unstyled
                      nodes:
                        - object: text
                          leaves:
                            - text: Inner 1
                - object: block
                  type: list_item
                  nodes:
                    - object: block
                      type: unstyled
                      nodes:
                        - object: text
                          leaves:
                            - text: Inner 2