Create Broadcast Property

curl --request POST \
  --url https://api.useinvent.com/orgs/{org_id}/broadcasts/{broadcast_id}/properties \
  --header 'Content-Type: application/json' \
  --data '
{
  "key": "<string>",
  "default_value": "<string>"
}
'

{
  "id": "<string>",
  "broadcast_id": "<string>",
  "key": "<string>",
  "default_value": "<string>",
  "created_at": "2023-11-07T05:31:56Z"
}