I am able to use power automate and trigger azure devops work item change, work item created options. But I am trying to find if there is a way to retrieve particular work item field, custom field changes and what values are updated. For example, if target work item date is changed from x to y, I want to sent a notification that value is updated from x to y. Will power automate support the functionality? Any suggestion or pointer would be of great help.
You could check which values have changed via the Updates method of the DevOps REST API, https://learn.microsoft.com/en-us/rest/api/azure/devops/wit/updates/list?view=azure-devops-rest-6.0&tabs=HTTP
I have shared an example of that approach in this thread: Power Automate - How to create Azure DevOps work items only once when the trigger is a work item update?