Generating schema with an Array property allowing multiple types of an interface

[HolyOne]

Hello, I am strugling to programaticly generate schema for my configuration and I wondered if there is a practicle way I am missing.

My Example Config file is this

{
"$schema": "config-schema.json" ,
"BackupDir": "c:\backup\",
"CompressionLevel": 2,
"Items": [
{"Type": "File" , "Path" : "c:\SomeDirectory", "ArchiveSize":128 },
{"Type": "File" , "Path" : "c:\SomeDirectory2", "ArchiveSize":128 },
{"Type": "MySQL" , "Server" : "localhost", "DB":"mydata" },
{"Type": "MySQL" , "Server" : "localhost", "DB":"mydb" },
{"Type": "MSSQL" , "Server" : "localhost", "DB":"mymsdb", "Username":"sa", "Password":"...." }
]
}

As you see In c#, I have an Items property of IEnumerable which only requires "Type" Parameter.
But It may also have other properties because Items can contain any class inherited from IBackupInfo.

public interface IBackupInfo
{
    string Type { get;   }
}  

I read the Items, cast them to the appropriate class using the common "Type" property.

How can I programaticly generate the schema file for this, (which is aware of all the class types i provide) ?