[RMMV] MODIFYING AUGMENT EFFECTS BY LEVEL

I have the Yanfly attachable augments plugin downloaded, and I'd like to tie the augment effects to the level of an actor. Is there a way to modify the augment effects so that the stat changes are multiplied by the level of an actor? Right now I can only implement simple stat changes, such as +5 HP, or +5% HP.

Ex. I want the augment to be tied to the level of actor 2. In my mind the formula would look something like:
<Augment Attach: type>
HP: +2*$gameActors.actor(2).level
</Augment Attach: type>

Or more ideally, the actor level would replace the constant (in this case 5) as a percentage change. For example this would make the stat change +5% when the actor is level 5, and +20% when the actor is level 20.

I'm new to RPG Maker and have essentially no coding knowledge, so I'm just trying to piece something together and I can't get it to work. Am I structuring it wrong, or does the plugin not support this?
ALSO: The actor whose level is being checked would not be in the party while the augment is equipped. Don't know if that affects anything, but I can provide more context for why I want the augment to work this way if it would be helpful.