I see that you are in this thread:
HASS.IO -> transfer from SD card to SSD or USB
There you have all information needed. Had a quick look at it and it doesn’t seem to be a simple task to accomplish.
Here is a guide that will allow you to run Debian from a USB connected drive, instead of the SD card.
STICKY: HOWTO: Move the filesystem to a USB stick/Drive
This will not work for HASSOS as is but will give you enough information to understand the procedure.
Edit: Found this thread as well:
Hassio booting off ssd on a Raspberry Pi 3b+