This stat will only work in the Player Statistics section, not the Summary sections.
Click Configure --> Configure Statistics, click Holdem Cash Player Statistics, go to the coulmns tab. Add a new column called cnt_bbj_rake with definition*: sum(if[holdem_hand_summary.amt_rake >= .75, .5, 0])
Add a description as you see fit. Go to the stats tab, create a new stat called BBJ Rake, using the value expression: cnt_bbj_rake
Go to the Format tab, give a title and width (if you use "BBJ Rake" something like 60 should be good), and as your format expressions: format_money(cnt_bbj_rake, true)
Save the stat, add it to your Player Statistics report on your General tab and there you go
*The expression used was chosen as from the terms, as soon as the rake gets to .25 it is immediately bumped to .75 total. Since the actual rake as a percentage of the pot may change at some point in time, this seemed to be the better way to go.