I'm not aware of those stats being in the
Repository, although it's possible.
You can build them, though.
The absolute size of the first raise a player makes is stored in the database field: holdem_hand_player_detail.amt_p_raise_made, or the raise as a percentage of the pot is stored in: holdem_hand_player_detail.val_p_raise_made_pct.
As an example of how to build this stat, have a look at Kraada's "Percent Bet on Flop" stat in the Repository.