async populateValues(spreadsheetId) {
    await this.sheetsService.spreadsheets.batchUpdate({
      spreadsheetId,
      resource: {
        requests: [
          {
            repeatCell: {
              range: {
                sheetId: 0,
                startRowIndex: 0,
                endRowIndex: 10,
                startColumnIndex: 0,
                endColumnIndex: 10,
              },
              cell: {
                userEnteredValue: {
                  stringValue: 'Hello',
                },
              },
              fields: 'userEnteredValue',
            },
          },
        ],
      },
    });
    return spreadsheetId;
  }
Adds a string to a 11x11 grid of Spreadsheet cells.
@param {string} spreadsheetId The spreadsheet ID.
@return {Promise} A promise to return the Google API service.