After three years ending ~EOY'19, I stopped tracking all these data. (It turns out combing every grocery store receipt and manually typing, categorizing, and calculating the data takes a lot of time.)
I can't say how my experience tracked or would have tracked inflation, but I can say that even before the pandemic, I did see wildly varying prices on things. Costco's large vanilla extract was once around $10 (though this was before my spreadsheet, so I don't have dates/exact prices). It was up to $35 in '18, then down to $30 a year later, and just a few days ago, I noticed it for a little over $20. But 25# of flour used to be around $6-7, and I bought a bunch the other day for ~$12. So some things up, others down.