curl --request POST \
  --url https://paradigm-preprod.lighton.ai/api/v3/instance/workspaces/{id}/members \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "role": "owner"
}
'

{
  "users": [
    {
      "id": 123,
      "email": "<string>",
      "role": "<string>"
    }
  ],
  "groups": [
    {
      "id": 123,
      "name": "<string>",
      "role": "<string>"
    }
  ]
}