@Anonymous
For now, SharePoint Migration Tool (SPMT) supports migration to SharePoint, OneDrive, and Teams from:
- SharePoint Server 2010, 2013, and 2016
- SharePoint Foundation 2010 and 2013
- Network and local file shares
Per my knowledge and research, there’s no Microsoft article about the migration from 2019 to Online. As Microsoft keeps working on its tools and services to extend the support for its products, we believe the SPMT will cover SharePoint Server 2019 migration scenarios one day but for now, about in June 2023.
If you only want to migrate contents of lists, libraries and wiki pages, manual migration is the only way. For reference, Information about manual migration of SharePoint Online content.
If you want to migrate contents and metadata of lists, libraries and wiki pages, you need to use third-party software such as ShareGate to migrate.
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