I’ve tried naively to import a preset from the Crushstation plugin (AUv3 on macOS) into the H9 Control app (on iPad) in order to save it to an H9 pedal. The app complained about an incompatible/indigestible/unexpected format and I didn’t make any further attempts.
Presumably this just isn’t supposed to work, but I really think it should. Of course, even more so for the H90.
Sorry for the inconvenience. The plug-in presets are currently not compatible with the stompboxes, but we may be able to add this feature in a future update. Thanks for the suggestion.