Sure

Though a warning from my experience, I tries to flash a OnePlus 8 that was carrier unlocked. There seems to be a second “unlock” that you need to provide at the time of flashing and oneplus’s site never returned a value.

On the flip side, flashing a pixel tablet was trivial, two Fairphone 5’s were trivial, and I actually bought a fairphone 6 with it already loaded from Murena.