How to rename a JToken

RenameToken.cs

private void RenameToken(JToken token, string newName)
{
   var parent = token.Parent;
   if (parent == null)
       throw new InvalidOperationException("The parent is missing.");
   var newToken = new JProperty(newName, token);
   parent.Replace(newToken);
}

JToken cpf = serializedCustomer["documents"]?["cpf"];
if (cpf != null)
   RenameToken(cpf, "Cpf");