Okay @anonymous_user_87e5ba83 … I have figured out how to get this to work:
You have to create an GroomAssetImportData object and pass in the GroomImportOptions object into the constructor. The finally set the GroomAssetImportData as the AssetImportTask options.
conversionSettings = unreal.GroomConversionSettings(rotation=[90.0, 0.0, 0.0],
scale=[1.0, -1.0, 1.0]) # maya to unreal diffs
options = unreal.GroomImportOptions()
options.set_editor_property(‘conversion_settings’, conversionSettings)
groomData = unreal.GroomAssetImportData(options)
AssetImportTask.set_editor_property(‘options’, groomData)
I had to troll through the C/C++ headers to figure that one out… yikes.