How to collect a list of links and distribute them?

Question

Android

Good afternoon, please tell me, there is an application with viewing video surveillance, so far I have added certain RTSP links to view to play the stream in real time. Objects with video surveillance about 100 pcs. and in order not to store all the links in the application itself, I want to create a file so that the necessary links are pulled from it.
File example:

[address 1]:
 -rtspURL1
 -rtspURL2
 -...
[address 2]:
 -rtspURL1
 -rtspURL2
 -...

There is also user registration through Firebase, and each user needs to be given different addresses, tell me how to implement such a function if, for example, in Firebase I set the user parameteridaddr:1

Example

and the user will receive links from the file under id address 1?