how do I create a duplicated node in ansible roles

I am trying to automate the same credential for cyberark to make different queries using Ansible. You can see the same details repeat and repeat again for:

username: user
password: p@ssword
server: abc.com

i have written a module for cyberark to handle all functions like retrieving passwords, creating new accounts, check account existence, etc

While I know it is possible for yaml to create duplicated nodes and modifying its value. I have tested the following code is working fine in a single playbook:

  hosts: localhost
  gather_facts: no

  vars:
          cyberArkUsername: user
          cyberArkPassword: p@ssword
          server: abc.com

          Details: &basicCA
                  state:
                  username: "{{ cyberArkUsername }}"
                  password: "{{ cyberArkPassword }}"
                  server: "{{ server }}"
                  account:
                          accountname:

  tasks:
          - name: check exist
            CyberArkModule:
                    <<: *basicCA
                    state: check
                    account:
                            accountname: test_CA

However when i try to migrate this logic to a role It doesn't work at all

var declared in vars/main.yml

CADetails: &login
        state:
        server: abc.com
        username: user
        password: p@ssword
        account:

when I try to run tasks/main.yml

- name: fetch password
  CyberarkModule:
    <<: *login
    state: check
    account:
        accountname: test_CA

it will prompt

Syntax Error while loading YAML. found undefined alias

what's the right way to save the few lines of code and duplication?