Passing Command Lines: Is there Documentation?

Is there some documentation somewhere on how to interface with HALion via command lines?

I’ve run through all of the Manuals and Dev Resources I know to check and can’t find info about parsing command lines to/from HALion.

I’ve noticed that Dorico is able to launch HALion instances with a multi VSTpreset (renamed as *.pluginstate), and then feed it commands to load different VSTpresets into individual slots.

Is there any documentation out there on this interface? At the moment I just need it to customize some templates for Dorico Pro, but it’d come in handy for other apps and projects as well!

I’ve managed to figure out how to get Dorico to load presets that are in an archive with a uri like so:
<URI>vstsound:/VST3 Presets/Steinberg Media Technologies/HALion Sonic/Program/1965 Combo.vstpreset?archive=341B82ED1CE64987B83112EB80A5DC69</URI>

This makes sense, as the archive hash names can be shown in the media bay, but how would one go about making Dorico load a user preset that is NOT packed into a vstsound library?

I’ve tried stuff like this but it doesn’t work…
<URI>file://E/User/Brian/Documents/VST3 Presets/Steinberg Media Technologies/HALion Sonic/Program/MyPreset.vstpreset</URI>

So what is the path to get at user presets that haven’t been packed into a vstsound container?

I’ve also opened a similar thread over in the Dorico room with a few more details on my immediate needs for such documentation.