I bought this PiFi DAC+ v2.0 from AliExpress
https://www.aliexpress.com/snapshot/0.html?spm=a2g0s.9042647.0.0.6d374c4d3EtoDb&orderId=8132811645466300&productId=4001341312450
I’m using it with a Raspberry Pi 4B (2GB). When I booted it up I2S DAC was automatically selected (ON), and the DAC Model was HiFiBerry Amp2.
It seems to work fine. I’ll have to dig a bit more into whether there is some tuning that is necessary.