Hi John,
Yes, the option to install hugging face models only works with models designed for cross prism. The default models shown from the crossprism repo are the only ones that are in the correct format (.mlpackage) and have the correct embedded metadata. In particular, the travel models used to be included with the App Store distribution but have now been offloaded to hugging face.
There are some model export features on the cross prism roadmap that will enable users to share their models on hugging face.
Which particular hugging face model are you trying to install? If it's in the correct format (mlpackage or mlmodel), it might be possible allow installation in a future update.
Regards,
Eric