I&#39;m trying to assign one of 2 values to a variable in addition to variable group and can&#39;t find the reference that how to use IF ELSE.

Basically I need to convert this jerkins logic to azure DevOps.

Jenkins
```
if (branch = &#39;master&#39;) { 
   env = &#39;a&#39;
} else if (branch = &#39;dev&#39;){
    env =&#39;b&#39;
}
```


I found 1 reference from the following one, but this one seems to work if the variables section doesn&#39;t have variable groups.
 
https://stackoverflow.com/a/57532526/5862540

But in my pipeline, I already have a variable group for secrets, so I have to use name/value convention and the example doesn&#39;t work with the errors like `expected a mapping` or `A mapping was not expected` or `Unexpected value &#39;env&#39;`


```
variables:
- group: my-global
- name: env
  value:
    ${{ if eq(variables[&#39;Build.SourceBranchName&#39;], &#39;master&#39;) }}: 
      env: a
    ${{ if eq(variables[&#39;Build.SourceBranchName&#39;], &#39;dev&#39;) }}: 
      env: b

```
or

```
variables:
- group: my-global
- name: env
  value:
    ${{ if eq(variables[&#39;Build.SourceBranchName&#39;], &#39;master&#39;) }}: a
    ${{ if eq(variables[&#39;Build.SourceBranchName&#39;], &#39;dev&#39;) }}: b

```

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how can I use IF ELSE in variables of azure DevOps yaml pipeline with variable group?