Netflow report for a specific IP group on a selection of nodes

To start, you can build IP address groups in the NTA settings.

https://documentation.solarwinds.com/en/success_center/nta/content/nta-managing-ip-address-groups-sw272.htm

So an important thing to know about netflow is that only a very limited collection of Cisco hardware support collecting flow data on layer 2 connections.   So if the esxi hosts happen to be in the same subnet then any host to host traffic will not be shown,  only traffic that gets routed out.

You can collect flow from the dvswitch inside vcenter if you have the right VMware license, which gives a more complete picture of all traffic,  even from vm to vm in the same host. 

thwack.solarwinds.com/.../introducing-the-nta-2020-2-ga-release---vmware-vsphere-distributed-switch-support

I'll throw in the warning that vm to vm traffic can be a lot of flows, so you'll likely end up needing to do some testing to be sure you can handle the volume of database activity.