Unexpected token error for json input

[LakshmiRavali]

I am working on GitHub actions, and I have a case where I need to send a multiline string as json. I am getting some unexpected token error.

This is my test.md and workflow:

---------------------------
  **test**
  - update something
  - another update
  
  **test2**
  - Add `test` to param
  

steps:
    - uses: actions/checkout@v2
    - name: Get Log
      id: getLog
      run: |
        CHANGELOG="$(cat test.md)"
        CHANGELOG="$($CHANGELOG//'%'/'%25')"
        CHANGELOG="$($CHANGELOG//$'\n'/'%0A')" 
        CHANGELOG="$($CHANGELOG//$'\r'/'%0D')"
        echo "::set-output name=changeLog::$CHANGELOG"
    - name: Invoke CLI workflow with changelog
      uses: benc-uk/workflow-dispatch@v1
      with:
        workflow: Workflow publish
        token: ${{ secrets.TOKEN }}
        repo: repo/name
        inputs: '{ "changeLog": "${{steps.getLog.outputs.changeLog}}"}'

I am getting an unexpected token error. How solve this?

Thanks in advance