I finally got ZWave-JS-UI installed with Snap on an RPi4. After trying various combinations of things (above) and elsewhere, I found that the simplest of all instructions worked fine, at least for me:
I finally got ZWave-JS-UI installed with Snap on an RPi4. After trying various combinations of things (above) and elsewhere, I found that the simplest of all instructions worked fine, at least for me: