Decrypt `.json` File and Generate Fernet Key

I need assistance with decrypting a `.json` file that requires a Fernet key. The key is not available, so the task involves generating a new 256-bit Fernet key and using it to decrypt the file. Deliverables include:
1. The decrypted `.json` file.
2. The code for generating the Fernet key and decrypting the file.

Ideal Skills and Experience:
- Strong knowledge of encryption and decryption methods (Fernet).
- Proficiency in Python or related programming languages.
- Experience with secure key management practices.