We'd love to hear more details about how you would use this with A220 FlexPods - it sounds like you might have a few?
If you can open a case asking how to enable iSER for iSCSI on ONTAP, along with details of the number of systems you have right now and how many you would be purchasing over the next 18 months, and then post the case ID here, we will make sure it gets to our product management team for review. I had a bit of a look through our cases and can't see yours.
Product design, feature selection, testing and deployment lifecycles tend towards longer term questions, so the sooner the better. We don't aim for feature parity between E-Series and ONTAP, so there will always be a few differentiators.
Thanks!