Creating Sub Filters within a new group

Hi All,

I have a set of data which has three columns, Name, Country and Price as shown in the picture below.

I have made a new column called Country (groups) where I have created a slicer so that the people who are in that region (ie Europe) are shown. So for example when I select Asia, Fred and Hannah are shown for Japan (JP) and Omara and Rupi are shown for Russia (RU).

However I would like to find a way so that when I select Asia in the Country (groups) filter it then shows Fred, Hannah, Omara and Rupi as singular clickable options so that they can selected individualy. Essentially I am looking to create something similar to the below picture. Can anyone help!?

Thank you in advance!

Jay