You can do that by duplicating & editing the existing columns for the built-in stat (cnt_wtsd_non_small & cnt_wtsd_won_non_small) and changing the amount the player contributes to the pot within the column expression:
cash_hand_player_statistics.amt_bet_ttl > 5When your new columns are created you can create the new statistic(s) -
this guide covers the basics on custom statistics creation.