Catalog Zone also-notify

I am using a catalog zone between my primary authoritative server and my 
secondary authoritative server.

I am now looking to add a third-party secondary server for a particular 
zone, so I need to set allow-transfer / also-notify on that zone.

It seems that catalog zones support custom properties:
https://bind9.readthedocs.io/en/stable/chapter6.html#catalog-zone-custom-properties

Unfortunately "also-notify" does not seem to be a supported custom property.

If it was the other way around (also-notify was supported, but 
allow-transfer was not), I could probably just set allow-transfer 
globally. But it certainly seems undesirable to set also-notify 
globally, as then the secondary would be notified for changes to all 
sorts of zones they are not involved with.

The documentation for also-notify mentions something about the 
"primaries" (formerly "masters") setting, but I can't quite see a way 
for that to be a solution here.

Am I missing something here, or should I file a feature request?

-- 
Richard

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