It will be useful to set some macro in trigger configuration and check it on action condition.
As an example some tickets suppose recovery message ("http down", "lack of disk space") and some do not ("host rebooted", "/etc/passwd changed").
Now I configured action condition
trigger name like "changed" or trigger name like "rebooted" or trigger name like "flapped"
and for another action
trigger name not like "changed" and trigger name not like "rebooted" and trigger name not like "flapped"
It will be much more convenient to define this attribute on trigger configuration. And there are another usecases for this feature.

I found similar issue ZBXNEXT-1645 but there requested using macro in action operations, I want use this macro in action conditions.