There isn't a built-in stat about, but you can build it.
Your stat will be in the Holdem Tournament Player Statistics section. You will need a pair of columns like this:
cnt_bb_raise_sb_limp_hu =
sum(if[ tourney_holdem_hand_summary.cnt_players = 2 AND tourney_holdem_hand_player_statistics.flg_blind_b AND NOT tourney_holdem_hand_player_statistics.flg_blind_de f_opp AND lookup_actions_p.action LIKE 'R%', 1 , 0 ])
cnt_bb_raise_sb_limp_hu_opp =
sum(if[ tourney_holdem_hand_summary.cnt_players = 2 AND tourney_holdem_hand_player_statistics.flg_blind_b AND NOT tourney_holdem_hand_player_statistics.flg_blind_de f_opp AND lookup_actions_p.action != '', 1 , 0 ])
Then build a stat with Value Expression:
(cnt_bb_raise_sb_limp_hu / cnt_bb_raise_sb_limp_hu_opp) * 100
For information on building a stat from these expressions please see the
Tutorial: Custom Reports and Statistics.