Unfortunately, this isn't possible currently but this is a great point and idea. I'll definitely share this with the team. Let me know if you need anything else.
Thank you Benjamin!
Just to chime in, and say it'd be INCREDIBLY useful to add the OpenType feature codes as toggles to the Filter panel on the Fonts search, and have a shortcut boolean text search code like "font-feature:onum,pnum,liga", etc.
Having to browse a font, add it to a kit, and only THEN see what it font-features it supports is counterintuitive and time-consuming.
On that note: It'd be kinda nice not to launch Kits in a new window. A cart-based UI with quick add from search would be way easier. Select, create kit if needed, add font to kit - then go to "My Kits" to view/edit them in detail if needed.