Recursive search values by key in docker inspect output : Cannot index string with string "RestartPolicy"

I'm trying to recursively extract with jq the RestartPolicy from the docker inspect json output of a container.

I tried this command adapted from this solution :

$ sudo docker inspect r-Gitlab-Gitlab-Runnerv2-1-12345678 | jq -r '.[] | .. | .RestartPolicy'nulljq: error (at <stdin>:281): Cannot index string with string "RestartPolicy"$

With grep, I can find it :

$ sudo docker inspect r-Gitlab-Gitlab-Runnerv2-1-12345678 | grep "RestartPolicy" -A3"RestartPolicy": {"Name": "always","MaximumRetryCount": 0            },$

How can I extract it recursively with jq ?