No. However if you give everyone of your race +1 UnitStat_myrace you can do
<GameModifier>
<ModType>Unit</ModType>
<Attribute>AdjustUnitStat</Attribute>
<StrVal>UnitStat_Accuracy</StrVal>
<StrVal2>UnitStat_myrace</StrVal2>
<Value>-30</Value>
<Provides>-30 Accuracy vs myrace unless user is myrace</Provides>
<vsHigher>1</vsHigher>
</GameModifier>