<PackageReference Include="System.Security.Cryptography.Pkcs" Version="11.0.0-preview.5.26302.115" />

System.Security.Cryptography.Xml.X509IssuerSerial

public struct X509IssuerSerial
Represents the <X509IssuerSerial> element of an XML digital signature.
namespace System.Security.Cryptography.Xml { public struct X509IssuerSerial { public string IssuerName { get; set; } public string SerialNumber { get; set; } } }