How to customize a core file in SuiteCRM SuiteCRM 8

Hello,

I hope you can help me with my question, as I haven’t been able to get a clear answer, and I want to make sure I’m asking it correctly this time.

My question is: Is it possible to customize the path of a core file in SuiteCRM? For example, I modified this file:
core/app/core/src/lib/fields/field-logic/update-value-backend/update-value-backend.action.ts

Can this modification be done from the extension folder to avoid directly altering the core files?

I would like to clarify that I’ve already reviewed all the frontend documentation and understand how to configure elements like defaultExt or create items within extensions, so I do not need guidance on that. However, this specific case is not documented.

Thank you in advance for your help and any guidance you can provide.
Best regards!