Can't install Nginx Amplify Agent

Trying to install Amplify Agent
https://amplify.nginx.com/docs/guide-installing-and-managing-nginx-amplify-agent.html#installing-the-agent

keep getting an error regarding :
```
# apt install nginx-amplify-agent
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package nginx-amplify-agent is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'nginx-amplify-agent' has no installation candidate

```

As I understand DEB10 is supported I am assuming this might be related to the fact of NGINX installed via autoinstall instead of package-manager.

Wondering how could I added it or how to included as an extra extension or package.
Thanks.