Hi @beta
Sounds like you’re looking for annotations/notes, which is currently not part of Metabase (0.32.9)
Go and upvote by clicking 
on the first post:
https://github.com/metabase/metabase/issues/3922
How much will it add the functionality of this annotation?
I don’t know. It all depends on prioritizing and the current development cycle.
thaks