Yes, but preferably with the tool dnSpy.
The code for that is in the method "BattleResultUI::InitialInfo". There's the following lines there for experience:
if (ff9abil.FF9Abil_GetEnableSA((int)pLAYER.info.slot_no, 235))
{
battleEndValue.value += this.defaultExp >> 1;
}
And for AP:
if (ff9abil.FF9Abil_GetEnableSA((int)pLAYER.info.slot_no, 236))
{
battleEndValue2.value = this.defaultAp << 1;
}
If you're not familiar with the shift operators, you can simply consider that "+= this.defaultExp >> 1" adds half of the default experience to the total, and "this.defaultAp << 1" is twice the number of AP (it's like a division or a multiplication by 2).
You can replace those formulae by something else, like "battleEndValue.value = this.defaultExp * 3;" for getting three times the exp with Level Up.
If you want to do it with Hades Workshop, it's in the panel "CIL Code -> Raw -> BattleResultUI -> InitialInfo".
It is CIL Code there, not C#, so it's harder to read/modify, but if you don't want to use dnSpy, I will check how to do (if it is possible: not all the methods can be edited correctly with HW). I can't do it right now.