So that’s my idea. Create a simple blueprint with a billboard component. When an object needs fixing, it spawns this billboard blueprint above itself, and saves it to a variable named “Child Help Sign” or whatever. When a help sign is spawned, you can increase the counter value on your HUD to see how many objects need repairing at the moment. Once an object is fixed, decrease the counter value and destroy the child help sign.
A few things to keep in mind:
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If your map is really large, you won’t really see the help sign if it’s far away. A way to fix that is to set Size in Screen Space in the billboard details, and it will be always the same size on the screen.
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Since the sign in not on the HUD, it may be hidden by walls and other objects. As a workaround, use Material Billboard instead of regular Billboard, make the material Translucent, and Disable Depth Test in the material Details. This way the help sign will always render on top of everything else.