Add multiple Accesslist to Host config

Is your feature request related to a problem? Please describe.
Currently, you have to create individual accesslists for combinations of allowed/disallowed IP Addresses. e.g.

Internal (only Internal access)
Internal+Customer1 (Internal + IP from customer1)
Internal+Service1+VPN (Internal + IP from Service1 and VPN)
etc.

This leads to a huge workload, if something changes (e.g. one of our IPs changed due to provider change, so we needed to edit multiple accesslists to update the IP)

Describe the solution you'd like
I think it would be great, to add multiple lists to a host and on saving, the lists get merged and added to the config.
also, when editing a list, which is assigned to a host, the host config should be updated.

Describe alternatives you've considered
Like descriped above, our workaround currently is to add multiple lists which partially contain the same ip addresses for each usecase.

Additional context

The issue names no files, tests, or entry points. First trace how hosts and access lists are saved and rendered into the Nginx configuration, then determine how multiple lists should be merged and how list edits trigger host updates. Done means a host can use multiple access lists and changes to an assigned list are reflected in its generated configuration.