How to migrate Legacy Realm users to MongoDB

I am migrating Legacy Realm into MongoDB using guide provided by support team.
All the data has copied from realm successfully excluding user (App user).
is any way to import users from realm to MongoDB ?

I just did with the help of realm-web sdk.

In my case I use the custom-auth function. So before I migrate the data I call the login function for every user I have:

const RealmWeb = require('realm-web');
const app = new RealmWeb.App({ id: 'app-id' })
const credentials = RealmWeb.Credentials.function({
   password: person.password
const result = await app.logIn(credentials)