What about having effects such as a third type of evasion, or anything like that?
Viewing post in Hakuen Studio Custom Parameters for RPG Maker MV MZ comments
Yes, you can make that. You can create any Custom Parameter you like.
And use them whenever you want: Script calls, damage formula, put them into variables, etc...
You just have to create it and choose when and how you will use it.
You can combine this plugin withDynamic Parameters, and change the evasion parameter according to a value set on a custom parameter for example.