https://docs.openshift.com/container-platform/4.16/edge_computing/image_based_upgrade/preparing_for_image_based_upgrade/cnf-image-based-upgrade-shared-container-image.html#ztp-image-based-upgrade-shared-container-directory_shared-container-directory

In the link above - there's a Verification example:

"During or after installation, verify on the hub cluster that the BareMetalHost object shows the annotation:"
$ oc get bmh -n my-sno-ns my-sno -ojson | jq '.metadata.annotations["bmac.agent-install.openshift.io/ignition-config-overrides"]

The above example command doesn't have the closing apostrophe.