So I’m trying to create something like this

Where I’ll have 4 sets of two digits. I want to be able to click/touch any set and stop it from counting down. The others will continue to count until they are touched.
I’m not really sure where to start on this. Like, would I make an animated texture or a sprite map? Or can I pull this off with a typeface? I would really appreciate a general overview of how I might pull this off. Thanks!