Is it possible to use the output from one helper function as a variable name?

[Nirusu]

I have a situation, where each host I want to scan requires a different value for a certain HTTP header.
While I could start Nuclei for each host and supply this either via -H or a variable passed in the template, ideally I can start Nuclei just once with a with a large array of hosts, given that it handles concurrency nicely :)

My approach thus was to supply a bunch of variables passed via the command line using -V, and then try to handle this in the template.
However, given that I need to use the Hostname variable here, I effectively end up having a nested variable expression where I want to use the output from the first helper function(s) as the variable name (not string!) for the outer expression.

Effectively, I want to do something like this:

nuclei -target https://google.com -target bing.com -target hey.com -V google_com_host_id=1337 -V bing_com_host_id=381782 -V hey_com_host_id=1121

And then with the template:

variables:
    host_var_name: '{{concat(replace(Hostname, ".", "_"),"_host_id")}}'

http:
  - raw:
    - |
      GET /hello HTTP/1.1
      Host: {{Hostname}}
      Host-ID: {{host_var_name}}

Each Host should have the Host-ID defined via the command line.

However, currently the output for Host-ID is the name of host_var_name (aka the name of the variable I defined over the CLI), but not the value of the variable I defined over the command line:

GET /hello HTTP/1.1
Host: google.com
Host-ID: google_com_host_id

Is it possible to do this in Nuclei, maybe even in a cleaner way?
Or am I better of just starting a separate instance of Nuclei for each host I want to scan?