what should I put in name value pair of update environment variable in power devops tool of pipeline?

I am a little bit confused what should I put in the update environment variable?

How can I update the environment variable of the solution in Azure pipeline? Steps that I followed

1. Created solution in power app.

2. Created canvas app within solution and set allow to "Automatically add environment variables when adding data sources" from General Setting.

3. Added SharePoint Data Source list in canvas app

4. Created Build and Release Pipeline using PowerDevops tools

5. Used Update environment variable agent job within release pipeline how do I use update environment variable or is there any way to update environment variable?