Feature Request: Please support multiple rounds for the sha512 custom password hash

Feature: Support multiple rounds for the sha512 custom password hash

Description: According to this response, Auth0 does not support multiple rounds for the sha512 custom hash. This makes it where we are unable to import our users to Auth0 while still keeping their preexisting passwords.

Use-case: Migrating our users to Auth0, while keeping their preexisting passwords.