register variable value + string

[Anthony Cheng]

Does anyone know how I would go about to register values into variable + string (within a loop), so something like:

  register: "{{ item }}"_LIST
  with_items: "{{ LIST.stdout_lines }}"  

or 

  register: {{ item }}_LIST

[ZillaYT]

I don't think this is possible. I also experimented with this and discovered, as you did, that it may not be possible.