For use in other tools I want to write in Lightroom Classic to a photo's keywords if a photo is part of a stack, but not on top of a stack.
For this the easiest would be to create filter which shows exactly that: all photos which are part of a stack, but not on top of a stack. (Then I would just apply a keyword to all of these photos.)
I tried get something with LightRoom’s filter bar, but counld’t find any attribute pertaining to stacks. I did find a 3rd Party plugin (John R. Ellis' Any Filter), but is that the only option? And if so, does it work reliably?
If that's not possible, it would still work to show all photos at all which are part of stack (on top or not), it just would be importat to ommit all photos which aren't in any stack. (Then I could still do the keyword applying when combined with some stack expanding/collapsing.)
How can I do this in LR Classic?