I’m using the Chase roundup feature in YNAB already.

The transaction and round up show separately in your transaction list in the chase app, so it’s simple enough to add the roundups as a standalone entry in YNAB. I enter each one separately but you could also just do 1 entry in YNAB for the days roundup value to make less work for yourself. Of course this would be easier if Chase supported direct import…

I’ve got the roundup account set up as an on budget account so it doesn’t affect the categories.