ok: [localhost] => {
    "changed": false,
    "failed": false,
    "invocation": {
        "module_args": {
            "aws_access_key": null,
            "aws_secret_key": null,
            "ec2_url": null,
            "filters": {
                "vpc-id": "vpc-841054ff"
            },
            "profile": null,
            "region": "us-east-1",
            "security_token": null,
            "validate_certs": true
        }
    },
    "subnets": [
        {
            "availability_zone": "us-east-1b",
            "available_ip_address_count": 59,
            "cidr_block": "10.0.19.192/26",
            "default_for_az": "false",
            "id": "subnet-db100986",
            "map_public_ip_on_launch": "false",
            "state": "available",
            "tags": {
                "Name": "abc-east-private-2",
                "business_unit": "ESP",
                "created_by": "xxx",
                "customer": "abc",
                "product": "SMC"
            },
            "vpc_id": "vpc-841054ff"
        },
        {
            "availability_zone": "us-east-1b",
            "available_ip_address_count": 58,
            "cidr_block": "10.0.19.64/26",
            "default_for_az": "false",
            "id": "subnet-01657c5c",
            "map_public_ip_on_launch": "true",
            "state": "available",
            "tags": {
                "Name": "abc-east-public-2",
                "business_unit": "ESP",
                "created_by": "xxx",
                "customer": "abc",
                "product": "SMC"
            },
            "vpc_id": "vpc-841054ff"
        },
        {
            "availability_zone": "us-east-1a",
            "available_ip_address_count": 58,
            "cidr_block": "10.0.19.0/26",
            "default_for_az": "false",
            "id": "subnet-fcf65bb6",
            "map_public_ip_on_launch": "true",
            "state": "available",
            "tags": {
                "Name": "abc-east-public-1",
                "business_unit": "ESP",
                "created_by": "xxx",
                "customer": "abc",
                "product": "SMC"
            },
            "vpc_id": "vpc-841054ff"
        },
        {
            "availability_zone": "us-east-1a",
            "available_ip_address_count": 59,
            "cidr_block": "10.0.19.128/26",
            "default_for_az": "false",
            "id": "subnet-9dc16cd7",
            "map_public_ip_on_launch": "false",
            "state": "available",
            "tags": {
                "Name": "abc-east-private-1",
                "business_unit": "ESP",
                "created_by": "xxx",
                "customer": "abc",
                "product": "SMC"
            },
            "vpc_id": "vpc-841054ff"
        }
    ]
}


I'm trying to make:

{
	"abc-east-private-2": "subnet-db100986",
	"abc-east-public-2": "subnet-01657c5c",
	"abc-east-private-1": "subnet-9dc16cd7",
	"abc-east-public-1": "subnet-fcf65bb6",

}

right now I do:

- name: "[{{ _aws_role_config.role }}::{{ _aws_vpc_name }}] Gathering VPC Subnet facts."
  ec2_vpc_subnet_facts:
    region: "{{ aws_vpc_map[_aws_vpc_name] }}"
    filters:
      vpc-id: "{{ _aws_vpc['id'] }}"
  register: _aws_subnet_facts

- name: "[{{ _aws_role_config.role }}::{{ _aws_vpc_name }}] Initializing _aws_subnets."
  set_fact:
    _aws_subnets: "{{ _aws_subnet_facts['subnets'] }}"

- name: "[{{ _aws_role_config.role }}::{{ _aws_vpc_name }}] Initializing _aws_subnets_map."
  set_fact:
    _aws_subnets_map: {}

- name: "[{{ _aws_role_config.role }}::{{ _aws_vpc_name }}] Constructing _aws_subnets_map."
  set_fact:
    _aws_subnets_map: "{{ { subnet['tags']['Name']: subnet['id'] } |combine(_aws_subnets_map) }}"
  with_items: "{{ _aws_subnets  }}"
  loop_control:
    loop_var: subnet