HP scanning on Silverblue : hp-plugin install

I found a way to use my HP scanner with SB.
The HP scanner needs the plugin provided by hplip to work, but it can’t be layered.
I installed hplip in a toolbox, launched hp-plugin (after installing python-gobject, which appears to be a dependency), then installed the scanning app in the same box (simple-scan).
And the instruction “toolbox run simple-scan” works.
Hope it’ll help.