How to define Kreatel options in KEA which have been used in isc-dhcp server ?

I need to migrate these options to KEA

class "STB" { match option vendor-class-identifier; }
subclass "STB" "Motorola_VIP1003";
subclass "STB" "ARRIS_VIP1113";
subclass "STB" "ARRIS_VIP4205";
subclass "STB" "ARRIS_VIP4205_VU";
subclass "STB" "ARRIS_VIP4302";
subclass "STB" "ARRIS_VIP4302BT";

pool {
                allow members of "STB";
                vendor-option-space Kreatel;
                option Kreatel.splash-protocol  "363";
                option Kreatel.kernel-protocol  "363";
                option Kreatel.bootcast-address "1.1.1.1:55555";
                option Kreatel.firmware-log     "1.1.1.1:19999";
                option Kreatel.http-server      "boot.tv.example.com";
        }

I already migrated class "STB" from isc-dhcp to a new format and tried to specify option-data to that class, but kea is not able to start with log:

DHCP4_PARSER_FAIL failed to create or run parser for configuration element client-classes: definition for the option 'dhcp4.Kreatel.splash-protocol' does not exist (/etc/kea/class-STB.conf:6:21)

{
    "name": "STB",
    "test" : "substring(option[60].hex,0,6) == 'VIP'",
    "option-data": [
        {
            "name": "Kreatel.splash-protocol",
            "data": "363"
        },
        {
            "name": "Kreatel.kernel-protocol",
            "data": "363"
        },
        {
            "name": "Kreatel.bootcast-address",
            "data": "1.1.1.1:55555"
        },
        {
            "name": "Kreatel.firmware-log",
            "data": "1.1.1.1:19999"
        },
        {
            "name": "Kreatel.http-server",
            "data": "boot.tv.example.com"
        }
    ]
}

Can somebody help?

Thank you.