Persist blutility invoked changes

I have a blutility for an actor that runs an extremely heavy (takes minutes to run) operation that creates and populates some Hierarchical Instance Meshes, but when I reload the level those changes are gone. Is there any way to persist these changes?

As far as I know any and all procedural content is just that, procedural and generated every time. Setting variables is different so if you know how many meshes you need add them to components and change their variables with the blutility.