For me anyway, most of my gmail emails are sent to people I am very familiar with (my wife, friends etc.) So the language I use will often contain personal joke

For me anyway, most of my gmail emails are sent to people I am very familiar with (my wife, friends etc.) So the language I use will often contain personal jokes or colloquialisms unique to us or our community. This feature would be so much more useful if it was trained on my own email. The click through rate would be much higher then, at least for me.