Unable to set $arg_WOPISrc annotation on kubernetes nginx ingress

as mentionned in this documentation Collabora Online for Kubernetes — SDK https://sdk.collaboraonline.com/ documentation i’m not able to add this line on ingress annotation

nginx.ingress.kubernetes.io/upstream-hash-by: "$arg_WOPISrc"

the configuration does not appear in the nginx.conf file. So if someone did it, i’d like to know how ? :slight_smile:

thank you

latest ingress nginx 1.8.1
k8s 1.24.10