Restore MariaDB mysqldump to Postgres?

I have a MariaDB mysqldump from Nextcloud v.20.2.2 with directories (was in an iocage) and am searching for a way to restore to the latest version of Nextcloud. The kicker is that the next install is Postgres. I have a few 100GB of data and a handful of users. What are my best options to get on latest version (truenas/kubernetes)?