Named group of servers, to use it in a zone statement

Hello

Do you know if we can set a named group of servers to use it in a zone statement ?

The goal is to do something like this to notify the secondaries, this way I can set only one time my IPs and call them by the name in the zone statement :

remote-servers secondaries-server-list {
  10.64.1.43;
  10.64.1.44;
  10.128.37.66;
  10.128.37.67;
};

key internal-key {
  algorithm hmac-sha512;
  secret "JzZu0dH+TO2U8Bgo4792aUBmvhs08hqZuw30StTFMij91LrIQBjd91fLoRupREoikrBq1cc9vYDub7Q+vGvl6g==";
};

zone "63.10.in-addr.arpa" {
      type primary;
      file "/var/cache/bind/internal/63.10.in-addr.arpa.db";
      also-notify { secondaries-server-list key internal-key; };
};

But I got an error with named-checkconf :  unexpected token 'internal-key'

I’m using Bind 9.20.15.

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