OncePer Argo CD notification logic

[ajax-bychenok-y]

I am playing with Argo CD notifications in particular with OncePer parameter in trigger section.
In general documentation recommends to use there something unique like git revision or so.

Git revision is not suitable for me because it sends notification for each sync action (new replicas count in manifests or so).

But I wish to send notification only for newer image tag. It's is unique but till I don't wish to deploy previous version because it seems that notification subsystem uses own history.

Let me be more specific. Supposing i have

...
oncePer: app.status.summary.images
...

And release next images versions:

1.26
1.27
1.28
1.26 # here I wont get any notification because I've already released it and oncePer is not unique

Is it possible to count changes only with previous version and get notification for last 1.26 image?