Wave 8 - Val Jean - Val Jean

The Val Jean's special ability is that "During the Modify Defense Dice step of the Combat Phase, you may disable up to 3 of your Upgrades to add 1 [EVADE] result to your roll for each Upgrade you disabled with this card."
My question is does this change the result of the rolled dice, or does this add an [EVADE] to the total. So if I rolled 3 defense dice and got 3 [EVADE]s could I then use the ability to have up to 6 [EVADE] results?
My question is does this change the result of the rolled dice, or does this add an [EVADE] to the total. So if I rolled 3 defense dice and got 3 [EVADE]s could I then use the ability to have up to 6 [EVADE] results?