Hi, guys, it's me again building GrapheneOS. 🤓 I built the kernel, built bonito and now I am on task to extract vendor files for Pixel devices. I called:
vendor/android-prepare-vendor/execute-all.sh -d bonito -b RP1A.200720.009 -o vendor/android-prepare-vendor

but received 
ImportError: No module named google.protobuf
OTA data extract failed

I installed google and protobuf with pip3, but apparently it is not visible. Could someone help me?