How to append strings selectively to looped output of dict2items?

I have the following dictionary structure (I guess it's two dicts nested within one):

machines:
  dev1:
     disks: 4
     user: fred
     NICs: eth0
  dev2:
     disks: 4
     user: joe
     NICs: eth0

I can use the dictionaries to create constructs as follows using looping and dict2items:

- debug:
     msg: "something {{item.value.user}} }}"
  loop: "{{ machines | dict2items }}"

This would output:

ok: =>
  msg: something fred
ok: =>
  msg: something joe

Sometimes, however, I need to change certain specific dict values on the fly by suffixing text. I may want the output from dict1 to change from something fred to something fred-somebody, BUT I would not want that same suffix, -somebody, to be applied to the user for dict2 (otherwise I guess I could do this: msg: "something {{item.value.user}}-string }}").

I'm wondering whether this can be done via applying certain filters to the loop? Any other thoughts?

Q: "How to append strings selectively to looped output of dict2items? ... wondering whether this can be done via applying certain filters to the loop? Any other thoughts?"

For a structured and generic solution approach one option would be to use Jinja2 Templating and one may also have a look into proper way to concatenate variable strings.

A minimal example playbook

---
- hosts: localhost
  become: false
  gather_facts: false

  vars:

    machines:
      dev1:
        disks: 4
        user: fred
        NICs: eth0
      dev2:
        disks: 4
        user: joe
        NICs: eth0

    prefix: 'something'
    suffix: 'somebody'

    has_suffix:
      dev1: true
      dev2: false

  tasks:

    - debug:
        msg: "{{ prefix ~ ' ' ~ item.value.user ~ '-' ~ suffix }}"
      loop: "{{ machines | dict2items }}"

    - debug:
        msg: |
          {% for dev in (machines | dict2items) %}
          {{ has_suffix[dev.key] }}
          {% endfor %}

    - debug:
        msg: |
          {% for dev in (machines | dict2items) %}
          {% if has_suffix[dev.key] %}
          {{ prefix ~ ' ' ~ dev.value.user ~ '-' ~ suffix }}
          {% else %}
          {{ prefix ~ ' ' ~ dev.value.user }}
          {% endif %}
          {% endfor %}

will result into an output of

TASK [debug] **************************************************************************************
ok: [localhost] => (item={'key': 'dev1', 'value': {'disks': 4, 'user': 'fred', 'NICs': 'eth0'}}) =>
  msg: something fred-somebody
ok: [localhost] => (item={'key': 'dev2', 'value': {'disks': 4, 'user': 'joe', 'NICs': 'eth0'}}) =>
  msg: something joe-somebody

TASK [debug] **************************************************************************************
ok: [localhost] =>
  msg: |-
    True
    False

TASK [debug] **************************************************************************************
ok: [localhost] =>
  msg: |-
    something fred-somebody
    something joe