How to add Points to a LandScapeSpline via C++ in a plugin?

Hey guys,

I want to develop a plugin for a project to create roads, which adjust to a landscape. I thought I would use the new non-destructive landscape functionality, but it seems to me, that everything according to the LandScapeSplines is locked into the editor. Is there a way to adjust the ControlPoints of a landscape (not at runtime, the plugin would be for the editor only) without adjusting the engine source code (registering a class of mine as a friend class, or changing the visibility of some variables)?

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