Yes, since you always know your own hole cards that is possible.
(Bear in mind that if you use this for opponents then the values will be much lower because most of the time we won't know what the hole cards are.)
You would need to make a new column to count the "premium" 4bets. You can start with the expression from cnt_p_4bet and add in tests for the holecard values you want to use from
this thread. (Note: that thread was written for PT3 so the database field names are different to PT4.)
cnt_p_4bet =
sum(if[cash_hand_player_statistics.flg_p_4bet, 1, 0])
So you want something like:
cnt_p_4bet_premium =
sum(if[cash_hand_player_statistics.flg_p_4bet and (cash_hand_player_statistics.id_holecard <= 3 or cash_hand_player_statistics.id_holecard = 26 or cash_hand_player_statistics.id_holecard = 49), 1, 0])
That's: AA,KK,QQ,AK for example. You can add more values, or remove some, depending on what starting hands you want to count as premium.
Then you stat could be:
(cnt_p_4bet_premium / cnt_p_4bet) * 100
The
Custom Stats Guide has an overview of custom stats in PT4, and the
Tutorial: Custom Reports and Statistics goes into much more detail about how to make custom stats (the latter was written for PT3, but the same principals apply to PT4).