virtualisation options do not exist for extraSystemConfig system in makeDiskoTest

[ilyx-me]

I'd like to run some validation tests for secureboot using the disk test lib but it appears that the virtualisation namespace does not exist for 'extraSystemConfig' so I cannot do virtualisation.useSecureBoot = true for the booted system. Is there a supported way to do this for the disko test lib or is this something I'm going to have to roll myself by defining a new test machine?

Thanks for the advise!