FluentValidation show object errors in one array - .Net 5.0

Question

How to show object errors in one array in Fluent Validation?

{
  "Succeeded": false,
  "Message": "Error",
  "Errors": [
    "[0].Must be Greater Than Zero",
    "[0].Cannot be Null"
  ],
  "Data": null
}

to

{
  "Succeeded": false,
  "Message": "Error",
  "Errors": [
    "[0]": [
         "Must be Greater Than Zero",
         "Cannot be Null"
    ]
  ],
  "Data": null
}

How to collect errors of object in one array. I want to return Validation error response something in second example. this is my FluentValidation class

public class InvoiceValidator : BaseValidator<InvoiceDTO>
{
    RuleFor(x => x.taxId)
                .Cascade(CascadeMode = CascadeMode.Continue)
                .NotEmpty().WithMessage(x => $"[{x.checkNo}].not empty
                .Length(10).WithMessage(x => $"[{x.checkNo}].max 10");

            RuleFor(x => x.companyName)
                .Cascade(CascadeMode = CascadeMode.Continue)
                .NotEmpty().WithMessage(x => $"[{x.checkNo}].not Empty")
                 .Length(3, 150).WithMessage(x => $"[{x.checkNo}].between 3-150");
}

And its exception when validation is not valid

 public class ValidateException : Exception
    {
        public List<string> Errors { get; }
        public ValidateException() : base("One or more errors")
        {
            Errors = new List<string>();
        }

        public ValidateException(IEnumerable<ValidationFailure> failures) : this()
        {
            foreach (var item in failures)
            {
                Errors.Add(item.ErrorMessage);
            }
        }
    }