No, but you can create a custom experience system.
For example: set the required experience to level up by 100 for all levels. Now you'll use this scale as a visual indicator of experience gain as a percentage.
Create hashtable values for heroes like this: "HeroExpCurrent" "HeroExpReqForLvlUp"
Paladin HeroExpReqForLvlUp = 1000
Archmage HeroExpReqForLvlUp = 500
Suppose that both have 250 HeroExpCurrent.
(250/1000) * 100 = 25% exp for Paladin
(250/500) * 100 = 50% exp for Archmage
Set this percent as real exp 0-99%
If 100% then just add lvl and set exp = 0, in general, you'll figure it out yourself.
You can also change the HeroExpReqForLvlUp parameter depending on the current hero level, etc.
Like: set HeroExpReqForLvlUp for Paladin = 1000 + (lvl * 200)
Just use your imagination and a little persistence, custom stuff is always better than hardcoded garbage.