Creating sequential numbers in the auto table jspdf column VusJs

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    columns: [
      {
        header: 'No',
        dataKey: 'Index',
      },
      { header: 'No Registrasi', dataKey: 'no_register' },
      { header: 'Kode Partai', dataKey: 'kode_partai' },
      { header: 'Sumber', dataKey: 'kode_partai' },
      { header: 'Tanggal Panen', dataKey: 'tanggal_panen' },
      { header: 'Tanggal Terima', dataKey: 'tanggal_penerima' },
    
    ],

I’ve tried to use index + 1, but it doesn’t work. I want my dataKey to be filled with sequential numbers according to the number of Arrays I get from the api service’s response. in what other way so that I can enter the serial number in the ‘NO’ column.I use Vuejs