curl --request PUT \
  --url http://localhost:8080/settings/{key} \
  --header 'Content-Type: application/json' \
  --data '
{
  "value": "<unknown>"
}
'

{
  "key": "<string>",
  "name": "<string>",
  "category": {
    "key": "<string>",
    "label": "<string>"
  },
  "type": "<string>",
  "is_optional": true,
  "has_override": true,
  "current": "<unknown>",
  "original": "<unknown>",
  "read_only": false,
  "choices": [
    {
      "value": "<unknown>",
      "label": "<string>",
      "description": "<string>"
    }
  ]
}