If you want to make a regular parameter value based on a custom parameter value, you will need another plugin:
Hakuen Studio Dynamic Parameters for RPG Maker MZ by Hakuen Studio
This let you change the values of any parameter type dynamically. So, for what you want, you can create a custom parameter called "vit"(that is not an hp/mp type), for example, and then use either actor or a class note tag and do that:
<DynParam mhp> return this.vit * 10 </DynParam>
For better understanding, please read both plugins help files.