Chickpeas and beets.
Yes, you are correct. Oxalate is pretty much all plant foods. The highest are spinach, beets, chickpeas. It’s pretty easy just to do a quick Google and ask, “which are the highest plant foods in oxalates.”
There’s also this app for people with kidney issues that list high oxilate foods. OxiPur- I don’t use it often because they seem to want a subscription now.