Using BlackBoxOptim with Flux

It has been noted that BlackBoxOptim now may be used as one of the optimizers in Flux in the latest release, but I can’t find any documentation or examples for how to use it. I know how to use each separately. I saw mention of something called sciml_train, but I could not find any documentation on that, either (I couldn’t find any hits for any of these on any search engines or Discourses)

Thanks for any links (or hints)!