Clear cache of specific block (not the full page).

[gety9]

Guys hi,

I have one small block that changes once in a 2 months or so. So i would like to clear cache with cron when it changes (we have specfic shedule)

I know i can clear full page cache of the pages containing this block.

But i wonder if i can make it a bit more efficient and clear cache only for this specific block on the pages containing it.