Is it possible to deploy 3rd party plugin solution service layer on vcenter directly?

Hi, 

I'm looking at this section of vsphere 6.5 document : http://pubs.vmware.com/vsphere-65/index.jsp#com.vmware.wcsdk.pg.doc/GUID-88363ADC-4F14-4A99-937E-634015751B56.html

Wondering if we can directly  deploy 3rd party service layer(java, nodejs, etc) on a vcenter appliance. Or it has to be on a external server?  

I like the new vsphere SDK provided highly extensive html UI and new service platform to interact with vcenter (as a external actor), but if its' possible to have our own service layer deployed right within vcenter/container, it would be saving a lot of network and boxing overhead.  Please let me know if it's doable, and if any, point me to the resource/guide that I can refer to. 

Thanks.

Lee.H