Need to enable the stub_status module

[ZTHawk]

How can I enable the metrics feature?
I followed this instructions: https://docs.nginx.com/nginx-amplify/nginx-amplify-agent/configuring-metric-collection/#metrics-from-stub_status
and used port "listen 127.0.0.1:51820;"

But nginxui conplains that stub_status module is not active.

How can I get this feature to start working?