variables

magic_settings_group:
  variable_a: "content_a"
  variable_b: "content_b"

Accessing:

tasks:
  - debug: msg="{{ magic_settings_group['variable_a'] }}"
  - debug: msg="{{ magic_settings_group.variable_a }}"

Iteration:

{% for var in magic_settings_group.keys() %}
  {{ var }}: {{ magic_settings_group[var] }}
  {{ var }}: {{ magic_settings_group.var }}  
{% endfor %}