What is the smallest level of granularity you can get on gemini API billing?

Looking to see what the lowest level of detail you can get on gemini API billing. Trying to track usage at the token/call that provides detail of breakthoughs from free tier into paid level on multiple models, whether because of RPM or Token Count. Google Cloud billing report seems to just bill by project but not in that level of detail. Tried a BiqQuery report but couldnt get it to work. Anyone do something like this?