The application is called Planner "Plugin for Microsoft Planner". 

The extension of Planner is currently not for Mac.

As a result of the extension, you will be able to create and manage cards in the form of columns, and the resulting card labels will include both the original estimation and the remaining estimation. You can manage multiple columns for each card. For example, it is possible to create two columns for each card, and to manage the original and remaining estimation separately. This will allow you to make a card label, and to add it to the column that is the result of an addition of the two columns.

It is possible to set different original estimations for each column, which allows you to keep track of the progress in each column separately.

As an option, it is possible to add the column to the default list of columns.