const options = {
  method: 'POST',
  headers: {
    'x-api-key': '<api-key>',
    'x-api-secret': '<api-key>',
    'x-connector-id': '<api-key>',
    'x-owner-id': '<api-key>',
    'x-session-token': '<api-key>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    key: '<string>',
    name: '<string>',
    description: '<string>',
    format: '<string>',
    unit: '<string>',
    optionSource: '<string>',
    options: [{value: '<string>', name: '<string>'}]
  })
};

fetch('https://api.runmorph.dev/v1/models/{modelId}/fields', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "key": "<string>",
  "name": "<string>",
  "description": "<string>",
  "format": "<string>",
  "unit": "<string>",
  "optionSource": "<string>",
  "options": [
    {
      "value": "<string>",
      "name": "<string>"
    }
  ],
  "isRequired": true,
  "isFieldReadOnly": true,
  "isValueReadOnly": true,
  "isCustom": true,
  "remote": {
    "key": "<string>",
    "metadata": {}
  }
}