Filtering for milestones in the Calendar widget

I have a Calendar widget that’s showing items from multiple boards. I want to see items and subitems where the Timeline is marked as a Milestone. If I set up a filter of the type:

Where Timeline is Milestone
Or
Where Subitem Timeline is Milestone

It shows not only the subitems but the parent items (even though they’re not milestones).

Is there a way to show all milestones, whether items or subitems, without showing the parent tasks?

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