For virtualisation, most people use a community run set of apps called Truecharts.
I will say that documentation/support for this is rubbish. They have a discord server only really there. Very hostile community in general.
Not sure why kubernetes is used. Docker is being phased out and will stop being supported in the future.
Also, the latest version of scale broke onedrive backups, which were handled by the gui, and now you're on the own to run rclone via the cli. Definitely, the devs are not working on a fix as stated in forum posts. This is a pretty fundamental requirement of an at-home NAS for anyone using onedrive for photo backup say.
Ix system forum devs are rude. I haven't posted there but searching through other people's threads for solutions to my problems show dismissive unhelpful answers by the devs/users.
All this is to say Truenas virtualisation is compromised, poorly documented, and run by a hostile community of devs both in true charts and the ix systems forums.
I regret not trying a different nas os, but I'm a bit invested now.