If you would accept custom roms in general, there are GSI ROMs available that you could try, it works (sometimes with some problems, it's good to read a little bit about GSI ROMs) even if there isn't a official ROM built specifically for your device.

Edit: It seems RestlessOS and VoltageOS have some unofficial builds in there, I heard that they're trying to be grapheneos, but for every phone (and because of this, some less security features)