Yes if you are an admin you can go into the Modx backend and manually change the password, and I believe you can send an email with a randomly generated or fixed pass, that might work as well
I might be out of my depth here, or maybe we are speaking past one another.
You seem to be looking on the server side, I am referring to logging into Modx as an admin.
From inside Modx you should have a list of users. The data is encrypted on the backend, serverside, but simply by definition the user list is available to admin users.
Maybe I am missing something, maybe you don’t have admin access.