How to override `mandatoryFeatures = ["big-parallel"]`

I’m trying to build a customized installer image for GitHub - tpwrules/nixos-apple-silicon: Resources to install NixOS bare metal on Apple Silicon Macs . I’m hoping to build it on my aarch64-darwin system by way of darwin.linux-builder.

Unfortunately I can’t build it on the default darwin.linux-builder because it requires big-parallel.

Instead of reconfiguring the virtualized build machine, is there any way for me to just override the requirement for big-parallel?

EDIT: I don’t see requiredSystemFeatures or mandatoryFeatures set anywhere locally.