FYI -
I just spoke to a TurboTax support rep over the phone (very quick process, they called me back after I posted my question via chat). It looks like Intuit doesn't have anything more up to date from Coinbase, and they suggested (apologetically) that I might try asking Coinbase about this.
Coinbase has this page describing using TurboTax, but doesn't say anything about exporting:
https://help.coinbase.com/en/coinbase/taxes-reports-and-financial-services/taxes/using-turbotax-or-c...
I suspect that Coinbase expects their customers to use a 3rd party transaction tracker. They mention CoinTracker, which has a free tier (up to 25 transactions), which I plan to look into.
