document:
  nodes:
    - object: block
      type: table
      data:
        align:
          - center
          - null
      nodes:
        - object: block
          type: table_row
          nodes:
            - object: block
              type: table_cell
              nodes:
                - object: text
                  leaves:
                    - text: A
            - object: block
              type: table_cell
              nodes:
                - object: text
                  leaves:
                    - text: B
        - object: block
          type: table_row
          nodes:
            - object: block
              type: table_cell
              nodes:
                - object: text
                  leaves:
                    - text: A1
            - object: block
              type: table_cell
              nodes:
                - object: text
                  leaves:
                    - text: B1
        - object: block
          type: table_row
          nodes:
            - object: block
              type: table_cell
              nodes:
                - object: text
                  leaves:
                    - text: A2
            - object: block
              type: table_cell
              nodes:
                - object: text
                  leaves:
                    - text: B2