Hi Moshin,
Not sure if I understand it, but are you trying to import users into your Mendix App using REST? If so, then yes, it is possible to create accounts based on the data you send to your Mendix App.
It is however not possible to do a full export of Mendix accounts, because the password is always stored encrypted in the database.
If you are looking for something like Single Sign-On, you can visit this link for more information:
https://docs.mendix.com/developerportal/deploy/mendix-sso/
Hope this helps!