Add comments to PBI table

Hi guys, I have the following table displaying some of our key metrics below:

Recently, we had some design changes on our website and want to track how these affect the above metrics. My initial plan was to add a comment to each of the days where we had a design change (similar to Excel where you can right click into a cell and add a comment, so it expands when your cursor reaches that cell), but apart from text boxes in PBI I did not find any sufficient solutions.

Is there an add-in or work around to make this similar to Excel comments where I'd move the cursor to a specific day and I'd expand and then explain the design change which occured?

Thanks a bunch!