Should be built into tb core Rated 4 out of 5 stars

I have always wanted this function, simple add short (or long) note to any email. I have a lot of emails with same sender and subject (actual content is in attachment), it's really hard to find certain message because search can't go into attacments. This is almost perfect but is there a way to show notes as one column in message list? I mean note itself not just icon.
Does the search dig into these notes, if not could that be done?