Comment 4 for bug 1875903

This seems to be a bug with the same cause: https://bugs.launchpad.net/ubuntu/+source/subiquity/+bug/1875560

Using json output sounds good, flags are represented as boolean values:
{
   "partitiontable": {
      "label":"dos",
      "id":"0x27690b00",
      "device":"/dev/sda",
      "unit":"sectors",
      "partitions": [
         {"node":"/dev/sda1", "start":2048, "size":116660224, "type":"83", "bootable":true},
         {"node":"/dev/sda2", "start":116664318, "size":8380418, "type":"5"},
         {"node":"/dev/sda5", "start":116664320, "size":8380416, "type":"82"}
      ]
   }
}