How to use a database in replit?

Hello, I have a question here, how to get alist to find the database address from the replit variable? If I edit the config.json file directly and fill in the database address, then others can also connect to the database based on the database address of config.json, which is very insecure, but I have not found a way to make alist look for the database address in the replit environment variable. Please let me know, thanks