curl --request POST \
  --url 'https://api.example.com/circuits/{circuit_id}/backpropagate_observables?HAIQU_API_KEY=' \
  --header 'Content-Type: application/json' \
  --data '
{
  "circuit_id": "<string>",
  "observables": [
    [
      [
        "<string>",
        123,
        123
      ]
    ]
  ],
  "max_qwc_groups": 123,
  "max_error_total": 123,
  "max_error_per_slice": 123
}
'

{
  "detail": [
    {
      "loc": [
        "<string>"
      ],
      "msg": "<string>",
      "type": "<string>"
    }
  ]
}