Is istio-sidecar-injector tunable via IstioOperator API?

Config
1

The istio-sidecar-injector ConfigMap has a 600 line multiline string under data->config, which has a key/value toggle for the sidecar injection policy. The CM is documented here.

However, I see nowhere in the IstioOperator reference, how that setting could be tuned.
I do see references to the old Helm values, which could be controlled as follows via an overlay file:

spec:
  values:
    global:
      proxy:
        autoInject: 'disabled'

So far we have avoided reverting back to the Helm API, and would like to keep it that way.
Is there something I am missing in the docs?