Concat multiple variables and strings in ansible playbook

I'm trying multiple concatenation when preforming with_items for the destination section.

Right now it looks like this:

- name: create app except+lookup
  copy: content="" dest="{{ dir.comp ~ '/config/con2dd/' ~ item.name ~ 'File.txt' }}" force=no group=devops owner=devops mode: 0755
  with_items:
...

I get:

We could be wrong, but this one looks like it might be an issue with
missing quotes.  Always quote template expression brackets when they 
start a value. For instance:            

    with_items:
      - {{ foo }}

Should be written as:

    with_items:
      - "{{ foo }}"

Tried couple of approaches but none resulted something that's working.

Is it possible to concat the variables with the strings?