I have a task template that is a PowerShell task that needs 3 parameters.

parameters:
    param1: ''
    param2: ''
    param3: ''

  steps:

    - task: PowerShell@2
      inputs:
        targetType: 'inline'
        script: | [string[]] $SqlCmdVariables = "${{ parameters.param1 }}" -split "," | ForEach-Object { $_.trim() }
                  [string] $file = "${{ parameters.param2 }}/${{ parameters.param3 }}" -replace "/", ""

I have a job template taht uses the task template like

jobs:
- deployment: DeploymentTest 

  pool:
    name: Default

  strategy:
    runOnce:
      deploy:
        steps:
      
        - template: ../../Template/Step/runPowerShellDeployment.yml
          parameters:
            param1: 'dbName=DbNameEnvA secondDbName=AnotherDBInEnvA'
            param2: 'someScriptFile.sql'
            param3: 'InstanceA'

            
        - template: ../../Template/Step/runPowerShellDeployment.yml
          parameters:
            param1: 'dbName=DbTestNameEnvA secondDbName=AnotherTestDBInEnvA thirdDb=YetAnotherDbInEnvA'
            param2: 'someScriptFile.sql'
            param3: 'InstanceATest'
            
        - template: ../../Template/Step/runPowerShellDeployment.yml
          parameters:
            param1: 'dbName=DbCucumberTestNameEnvA secondDbName=AnotherCucumberTestDBInEnvA OtherParam=JustToShowThatParam1IsJustAString'
            param2: 'someScriptFile.sql'
            param3: 'InstanceACucumberTest'

What I would like to do is to use a loop for each environment and define the parameters in separate files (envA.yml, envB.yml, etc.). But I’m not sure about how to define the parameter values in the files and how to read it in the new template like here for param1, param2 and param3 :

parameters:
- name: environmentsToDeploy
  type: object
  default:
  - EnvironmentA
  - EnvironmentB


jobs:
- deployment: DeploymentTest 

  pool:
    name: Default

  strategy:
    runOnce:
      deploy:
        steps:
      
        steps:
        - ${{ each value in parameters.environmentsToDeploy }}:
            - template: ../../Template/Step/runPowerShellDeployment.yml
              parameters:
                param1: 
                param2: 
                param3: