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I think Rancher Desktop is using k3s -- try

$ rdctl shell
lima-rancher-desktop:/Users/jamieroberts$ k3s server -h
...
   --kube-apiserver-arg value                 (flags) Customized flag for kube-apiserver process

Then look on /etc/init.d/k3s ... I think you can supply ADDITIONAL_ARGS in /etc/environment -- or better

/etc/init.d/k3s.env