I never did manage to get plug-and-play going, but loading the .json manually works for me. (Yay!) I installed the beta firmware on my Portico, and the page has a nice short step-by-step.
I will note the current version I’m using will crash the software when clicking the “lighting” tab. From there I’ve had to restart VIA and re-load the .json, but it’s all good from there. (It also does include the default lighting controls, despite what the page says at time of writing.)