It looks like Windows Server 2019 has been supported in ESXi 6.5 U2 since November 19th 2018. VMware Compatibility Guide - Guest/Host Search
As far as installing it yes, use Server 2016 see KB 59222 VMware Knowledge Base
It looks like Windows Server 2019 has been supported in ESXi 6.5 U2 since November 19th 2018. VMware Compatibility Guide - Guest/Host Search
As far as installing it yes, use Server 2016 see KB 59222 VMware Knowledge Base