This file is over 500MB, couldn't even open it with NP++. Got it open with notepad, but I don't even know where to start with this:
This is standard JSON - there are a lot of resources online to help you learn the format.
I'd recommend using a code editor - for example visual studio code from Microsoft (free). Rename the file with a .json extension as most editors will then provide an option to 'format/beautify' the file, and make it easier to understand.
Most entries should be self explanatory; you may need a Spanish dictionary for some terms (ex. Nivel is level, piscina is pool, etc.). The hexa m_id are usually unique labels pointing to another object inside the file, etc.
Make sure you keep backups, as modifying this may corrupt the file itself.
-T-