How to use vpuppr with OBS Studio on Linux?

[phoulx]

I first tried the flathub version, which failed to start. Then I downloaded the zip package and it runs well.
And it successfully tracks with iOS VTube Studio.
Now I want it (currently the default duck) to appear on my OBS. I clicked the "add source" button on OBS, but no source of vpuppr shows.
The quick start doesn't mention it, so I come here for help.
Did I miss something? How to make the vpuppr model as a source to load on OBS?

Platform Info:
Linux debian 6.6.13-amd64, Gnome 44.8, wayland
OBS 30.0.2
vpuppr 0.9.0