test.cs

// Create a hierarchical table from a list of JSON objects
private void CreateTable(List<JObject> dataObjects) {

  // Get the number of columns of the first object
  int columns = dataObjects[0].Values().Count();

  // Check if the first object contains an array and reduce the number of columns
  columns -= dataObjects[0].Values().Count(value => value.Type == JTokenType.Array);

  // Add a table with the number of columns
  Table table = AddTableAtInputPosition(1, columns);
  int row = 1;

  // Loop through all objects
  foreach (JObject dataObject in dataObjects) {

    // Check if the row is not the first row and add a new row
    if (row != 1) {
      table.Cells.GetItem(row - 1, 1).Select();
      textControl1.Selection.Start += textControl1.Selection.Length;
      textControl1.Selection.Length = 0;
      textControl1.Selection.Start -= 1;
      // Add a new row after the current row
      table.Rows.Add(TXTextControl.TableAddPosition.After, 1);
      // Set the left text distance to 0 to remove the indent
      table.Rows.GetItem().CellFormat.LeftTextDistance = 0;
      // Split all cells 
      table.SplitCells();
    }

    int col = 1;

    // Loop through all properties of the object
    foreach (var info in dataObject) {

      // Check if the property is an array
      if (dataObject[info.Key].Type == JTokenType.Array) {

        textControl1.Selection.Start = table.Cells.GetItem(row, 1).Start;
        table.Rows.Add(TXTextControl.TableAddPosition.After, 1);

        // Set the left text distance to indent the nested table
        table.Rows.GetItem().CellFormat.LeftTextDistance = 600;

        // Select the new row and merge all cells
        table.Select(row + 1, 1, row + 1, table.Columns.Count);
        table.MergeCells();

        // Create a new table for the array
        List<JObject> subObject =
          dataObject[info.Key]?.Select(x => x as JObject).ToList();

        // recursively call the method to create a new nested table
        if (subObject != null) {
          CreateTable(subObject);
          row++;
        }
      }
      else { // Add the value to the table cell
        table.Cells.GetItem(row, col).Text = info.Value?.ToString();
        col++;
      }

    }

    row++;
  }
}

// Add a table at the current input position and return the table object
private Table AddTableAtInputPosition(int rows, int columns) {
  textControl1.Tables.Add(rows, columns);
  textControl1.Selection.Start -= 1;
  return textControl1.Tables.GetItem();
}