I agree with @4c74356b41 AFAIK that's not possible without creating a full-blown extension\addon.
Reference taken from :
Azure DevOps-Add extension that adds custom tab to Pipeline / Release Definition page (not the summary page) - Stack Overflow
. I don't know the term I should use to search for it.I am just not sure what to search in google to learn more about it.
you can search for the following terms on Google :
- Azure DevOps extension samples
- Azure DevOps extension custom tab
- Azure Devops Extensions Overview
I am ok with adding addon\extension. I actually want to know some document references that can be useful in this scenario
As you are ok with extension you can refer this MS document Extensions overview.
To create a new tab in a pull request, you need to create an extension that adds the new functionality to Azure DevOps. You can use Visual Studio to create a new Azure DevOps extension project.
Reference for Working with Pull Requests in Visual Studio Code and Azure DevOps
Reference SO thread