Import multiple hashed password


I know how the Import Password Hash works to migrate existing password from a database to Okta using the Hashed password object (Users | Okta Developer).

We have a database which currently has password hashed with the following algorithm :
sha512 ( sha512 ( password + salt 1) + salt 2) == hash

From what I’ve seen and test, I don’t think this kind of hash is migrable to Okta but I would have like to have an external point of vue for this topic.