Migrating large number of Nintex based SPS 2019 Workflows to SPO

Hi SP Brain trust,

We’re migrating a SharePoint 2019 on-prem farm (200+ sites) to SharePoint Online, which includes massive 100+ Nintex workflows heavily used across the business and we’re working within a tight timeline which makes it a massive challenge to go down the modernisation path.

Has anyone migrated a large number of Nintex workflows (100+ ) from SharePoint 2019 to SharePoint Online using 3rd party tooling? What approach or tools did you use, how much manual rework was involved, and what was your overall success rate and effort like?

Thank you!