Hello back at yeah...
I opened a thread in the Suggestions section of the Forum for just this capability, just the other day. I also asked if anyone had figured-out a method. The only one that appears possible, is to embed the counter HTML in the "Store Header", which can be done at Store tab, Edit Store Header. You're limited to 100 characters, which would wipe my header info; so I haven't tried that possible method.
I think 100 characters, which includes any HTML formatting for the text, is kind-a restrictive. Raising that limit would certainly open up possibilities for both formatting and adding things like counters.
Danno