@olivierlambert
Yes of course.
I've contacted to the team that created such kickstart ISO, based in RedHat EL 8.4.
That kickstart looks for /dev/vda but with modifications, now I have an ISO that installs automátically into /dev/xvda.
That fits perfectly in XCP-NG schema and now I can continue with the product virtualization.

@olivierlambert Thank you.
Yes, in parallel, I am trying to talk to OS guys. It is hard to convince them, because the kickstart was designed to be installed on baremetal or under ESXi. I would like to work in XCP instead. I will do my best.