Technically yes but you're going to have an extremely difficult time making it boot, let alone even build, because majority of devices have serious flaws in them that require dropping substantial amounts of GrapheneOS hardening, privacy features, and other patches and applying various hacks to make things work, to the point that the amount of effort and resources invested into such thing could have been spent on simply buying a supported Pixel, rather than trying to make a buggy device work with half-baked GrapheneOS patches tacked onto it.
It's not an easy task as it sounds, you require substantial kernel development, AOSP development skills, resources, time, and effort. Likely even an actual team. Not "Linux skills" or "Android Java development".
Given the device came out just this year, it's also safe to say upstream AOSP support for the device is very lackluster.