You're using the snap version of chromium, which is strictly confined,
and thus won't let you access /dev/bus/usb/001/011 by design.
Using chromium-browser from the ubuntu archive should allow you to see
your device:
sudo apt install chromium-browser
chromium-browser
Now, I'm also
** Package changed: chromium (Ubuntu) => chromium-browser (Ubuntu)
** Summary changed:
- Chromium cannot use WebUSB
+ Chromium cannot use WebUSB (works fine in Chrome)
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** Attachment added: "chrome_version.html"
https://bugs.launchpad.net/ubuntu/+source/chromium/+bug/1780678/+attachment/5161189/+files/chrome_version.html
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