So I used the Exposed Property trick and it works, unfortunately in my case, I’m moving an Actor Child Component that serves as an anchor to indicate until which position I should spawn sub-actors in my Construction Script. This makes it really convenient to edit things visually (this is based on an old UE4 tutorial showing how to spawn pillars at regular intervals between a start and end position, which unfortunately I can’t find anymore so I don’t remember how they did it).
So the trick is to add an Editable float Distance variable to determine until where I should Add Child Actor Components - but that loses the convenience of visual editing (dragging an anchor) in the scene.