enable users to define their own routes

You can map an entire array in CI4 as well.
https://codeigniter.com/user_guide/incom...ple-routes

But you need to write your own code get it there. Depending on how you do it, that can be a security risk, if you allow them to manipulate it without validation.

Thank you. So basically I can use the same Routes.php from CI3, I just need to load it and map it in CI4. Can you suggest the best place to store that PHP array file in CI4 for structure?