I would like to create a custom visitor group criterion that accepts a list of emails to be part of the group, how would I go about configuring that?

Something like this but there needs to be a step where the input string is split into separate email addresses.

    public class EmailListModel : CriterionModelBase
    {
        [DojoWidget(WidgetType = "dijit.form.Textarea")]
        public string[] Emails { get; set; }
        
        public override ICriterionModel Copy()
        {
            return ShallowCopy();
        }
    }

    [VisitorGroupCriterion(
        Category = "User Criteria",
        Description = "",
        DisplayName = "Email list")]
    public class EmailListCriterion : CriterionBase<EmailListModel>
    {
        private readonly CustomerContext _customerContext;

        public EmailListCriterion()
        {
            _customerContext = ServiceLocator.Current.GetInstance<CustomerContext>();
        }

        public override bool IsMatch(IPrincipal principal, HttpContextBase httpContext)
        {
            var currentCustomerEmail = _customerContext.CurrentContact?.Email;

            if (string.IsNullOrWhiteSpace(currentCustomerEmail))
                return false;

            return Model.Emails.Contains(currentCustomerEmail);
        }
    }