There is no rule that works like that.
But you can create 2 strategies, one that bets on matches where favorite is home team and second one that bets on matches where favorite is away team. Then you can use "Hedge" rule to execute when score is 0:1, 1:2 etc in strategy that bets on matches where home team is favorite.
To check if home team is favorite you can use Market conditions->Min/max REQUIRED price for selection rule and set it to check if runner by position 1 is within price range 1.01 - 2.0, as that would make it favorite. That is used if your strategy is betting on Match odds market. If you are betting on some other market then use "Selection conditions->Bet if specific market selection is in price range" rule to check odds of runner by position 1 at MATCH_ODDS market.
