Now, I would like to know its footprint. When I open my .map file, I can find symbols in the ApplicationCode section, but I would like an automated way to either put them in a dedicated category, or at least have their total footprint output in the console.
Is there a way to customize the .map file view to have such additional information?
In your case, you have to create a new graph (aka a new group of sections) from symbols names corresponding to your library code.
Usually, the library is declared in a dedicated Java Package.
Assuming your custom library is in the com.mycompany package, you can declare in a .mms file the following command with the given symbol pattern: