Unable to find Attributes while UI testing in market extension.

Summary:

As I understand you are using the Extensions tile to add a new field that you want to expose in the UI.

What you have done is the extending the api schema which is what this "Extensions" capability provides. It allows you to ingest data using API only

In order to see the field in the UI, you need to use VB Studio. Launch app is build using Oracle Visual Builder Studio and JET components. You can use the same tools to surface up the field. Please refer to application extension.

Hope this should help you extend the dynamic table to display additional data.