Variable substitution in left side of expression

[Co S]

Hello All,

I'm trying to re-use a task (by calling it for different purposes via include) so that I can substitute the values of one of module options.

So in one case I have dimension_name="HealthyHostCount" and in another dimension_name="BackendConnectionErrors" but it doesn't work as I want.

It doesn't throw error but "{{ dimension_name }}" is not substituted.

- name: Create alarm
  ec2_metric_alarm:
    region: "{{ aws_region }}"
    ...
    dimensions:
      "{{ dimension_name }}": "{{ dimension_value }}"
    ...
    state: "{{ state }}"

task 1:

- name: Create alarm
  ec2_metric_alarm:
    region: "{{ aws_region }}"
    ...
    dimensions:
      "HealthyHostCount": "{{ dimension_value }}"
    ...
    state: "{{ state }}"

task 2:

- name: Create alarm
  ec2_metric_alarm:
    region: "{{ aws_region }}"
    ...
    dimensions:
      "BackendConnectionErrors": "{{ dimension_value }}"
    ...
    state: "{{ state }}"

I want to avoid creation of 2 tasks like above with conditions rather use one tasks as I might have many possible values for "dimension_name" and the file become large and complex.

Is there any way to have a variable value substituted in left side?

Thanks,

Constantin