Git Notes - Search Functionality

Hello All

   I working on Git Notes. I want to know if there is an easy way to
obtain a list of all "namespaces"(For eg., git notes --ref=namespace
... ) with notes objects in a specific git repository. We can easily
create, edit, merge git notes with commands if we know the namespaces
and/or the sha. But, for example, Has anyone tried to search for a
string in a git notes objects for that project etc?
  The closest i can think of is using some options with git logs, for
example, git log --show-notes=*  --format="%H %N" etc.

Appreciate your time.

thanks
Krishna Chaitanya