That’s not really how engines like Unreal work. There’s no such thing as absolute elevation. You could be at the origin (0, 0, 0) and yet for gameplay purposes you might treat that as an elevation of 10,000ft.
But there is always the Z-component of a position. If you build your levels “correctly” the Z-component of any position could be considered the elevation. No one outside your project would call it elevation, but you could use it that way.