First, create a Power App with CDS data, Save and Publish.
Remember the App Id.
Once, We have all information ready then Login to Talent. Click on any workspace where Power App needs to be added. Right-click on the screen, click on personalize this form and insert a PowerApp.
Specify Name of PowerApp, App ID mentioned above and click OK.
Refresh the form and click on the workspace where we have added PowerApp.