Hi @Julio,
Your config seems to be placed in the right place (I mean in the Helm values.yaml), you could run the below and check if it has been applied as expected:
curl --insecure -u admin:<admin_password> -XGET https://<OpenSearch_node_FQDN_or_IP>:9200/_plugins/_security/api/securityconfig?pretty
Have you tried using ENV variables? You can see a similar case here.
best,
mj