this is interesting
https://paxex.aero/jetblue-a220-first-delivery/
The really managed it to pack it in there while maintaining the 32 inch pitch. 30 EMS seats! That's a little more than the 25 original planned. So A220 will have 21.4% of seat as EMS vs 25.9 on the 162 seat A320 and 16% on E90.

I'm guessing the mosaic should be able to get their day of upgrades. FAs might not be so happy with the reduced galley space.