Conditional variable of a variable in Azure DevOps Pipeline

gistfile1.yaml

variables:
  - name: project
    value: tamops
  - name: teamName
    ${{ if eq( variables['project'], 'tamops') }}: 
      value: "alpha"
    ${{ if eq( variables['project'], 'preproduction' ) }}: 
      value: "beta"
    ${{ if notIn( variables['project'], 'tamops', 'preproduction') }}: 
      value: "charlie"

stages:
- stage: TeamToDeploy
  jobs:
  - job: Example
    steps:
      - task: Bash@3
        displayName: TeamDeployed
        inputs:
          targetType: inline
          script: |
            echo ${{variables.teamName}}



#### sample output
Starting: TeamDeployed
==============================================================================
Task         : Bash
Description  : Run a Bash script on macOS, Linux, or Windows
Version      : 3.189.0
Author       : Microsoft Corporation
Help         : https://docs.microsoft.com/azure/devops/pipelines/tasks/utility/bash
==============================================================================
Generating script.
Script contents:
echo alpha