How to dynamically change variables in YAML pipeline based on trigger - yaml

Question

I am new to YAML. I have environments and variables specified per environment. However, I have couple of items where I could use help.
I am trying to understand how do I specify variable groups and environments based on trigger or target branch? Here is what I am looking for.
How do I trigger deployment to two environments based on one trigger?
If trigger is "master" then deploy to "Prod" and "Dev" environments
If trigger is "feature/*" then deploy to "QA" environment
Follows the psudo code. I understand that "Build.TargetBranchName" is not a variable, but I am looking for something similar to achieve selective deployment.
trigger:
branches:
include:
- master
- feature/*
- bundle/*
variables:
- ${{if eq(variables['Build.TargetBranchName'], 'feature/123-mybranch')}}:
- group: dw-qa
- name: 'sql-server'
value: 'QA001.SEMPRA.COM'
- name: 'environment'
value: 'QA'
- ${{if eq(variables['Build.TargetBranchName'], 'master')}}:
- group: dw-dev
- name: 'sql-server'
value: 'DV001.SEMPRA.COM'
- name: 'environment'
value: 'DEV'
- ${{if eq(variables['Build.TargetBranchName'], 'master')}}:
- group: dw-prod
- name: 'sql-server'
value: 'PD001.SEMPRA.COM'
- name: 'environment'
value: 'PROD'
stages:
- stage: Build
jobs:
- job: Build_Solution
displayName: 'Build Solution'
pool:
name: 'Shared Server Pool'
steps:
- script: md BuildOutput
displayName: 'Create BuildOutput folder'
- task: VSBuild#1
displayName: 'Visual Studio Build'
inputs:
solution: 'DataWarehouse/DataWarehouse.sln'
platform: 'Any CPU'
configuration: 'Debug'
- task: PublishPipelineArtifact#1
displayName: 'Publish artifacts from BuildOutput folder'
inputs:
targetPath: 'BuildOutput'
artifact: 'DacpacAndConfig'
publishLocation: 'pipeline'
- stage: Deploy
jobs:
- deployment:
pool:
name: 'SEU WinTel VX Shared'
environment: '$(environment)'
strategy:
runOnce:
deploy:
steps:
- script: md DeploymentSource
displayName: 'Create DeploymentSource folder'
- task: DownloadPipelineArtifact#2
displayName: 'Download artifacts to DeploymentSource folder'
inputs:
buildType: 'current'
artifactName: 'DacpacAndConfig'
targetPath: 'DeploymentSource'
- task: SqlAzureDacpacDeployment#1
displayName: 'Deploy STAGE'
inputs:
azureSubscription: 'My-MSSQL-Subscription'
ServerName: '$(sql-server)'
SqlUsername: 'ado-dw'
SqlPassword: '$(sql-password)'
DatabaseName: 'STAGE'
PublishProfile: 'DeploymentSource\STAGE.publish.xml'
DacpacFile: 'DeploymentSource\STAGE.dacpac'
Thanks in advance.
Palak