Feature Request: Support for External Placeholders in Level Calculation

[YodaZen]

Description
Currently, the level calculation is performed using a default formula of {} / 2, where {} serves as a placeholder for worth. I propose extending this functionality to allow the use of external placeholders for calculating levels.

Proposed Change
I would like to implement the ability to specify an external placeholder, such as %random_placeholder%, in the level calculation. An example of the new formula could be:
%random_placeholder% / 2

Benefits
This enhancement would provide greater flexibility in managing levels, allowing users to customize the calculations based on external data.